Windows cache corruption after repeatedly running tests

### Zig Version

0.10.0-dev.3659+e5e6eb983

### Steps to Reproduce

This is a weird issue and I'm not entirely sure how to trigger it. Over time, tests begin to fail building more frequently. Here's an example on a brand new project:

```zig
// build.zig
const std = @import("std");

pub fn build(b: *std.build.Builder) void {
    const a_tests = b.addTest("src/a.zig");
    const b_tests = b.addTest("src/b.zig");
    const c_tests = b.addTest("src/c.zig");

    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&a_tests.step);
    test_step.dependOn(&b_tests.step);
    test_step.dependOn(&c_tests.step);
}
```

```zig
// a.zig, b.zig, c.zig all contain the following
test {}
```

I'm not sure if this problem also exists on stage1 because self-hosted recompiles things every `zig build test`, but stage1 just runs the cached test binaries.

### Expected Behavior

There shouldn't be any build failures.

### Actual Behavior

Command line output:

```
d:\Scratch\testfailure>zig init-exe
info: Created build.zig
info: Created src\main.zig
info: Next, try `zig build --help` or `zig build run`

[fill in the files using the above snippets]

d:\Scratch\testfailure>zig build test
All 1 tests passed.
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
error: InvalidFormat
error: test...
error: The following command exited with error code 1:
D:\Scratch\zig-install\bin\zig.exe test D:\Scratch\testfailure\src\b.zig --cache-dir D:\Scratch\testfailure\zig-cache --global-cache-dir C:\Users\jcmoyer\AppData\Local\zig --name test --enable-cache
error: the following build command failed with exit code 1:
d:\Scratch\testfailure\zig-cache\o\6be072760b1c422c81d96f0d8413e4e5\build.exe D:\Scratch\zig-install\bin\zig.exe d:\Scratch\testfailure d:\Scratch\testfailure\zig-cache C:\Users\jcmoyer\AppData\Local\zig test

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
error: InvalidFormat
error: test...
error: The following command exited with error code 1:
D:\Scratch\zig-install\bin\zig.exe test D:\Scratch\testfailure\src\b.zig --cache-dir D:\Scratch\testfailure\zig-cache --global-cache-dir C:\Users\jcmoyer\AppData\Local\zig --name test --enable-cache
error: the following build command failed with exit code 1:
d:\Scratch\testfailure\zig-cache\o\6be072760b1c422c81d96f0d8413e4e5\build.exe D:\Scratch\zig-install\bin\zig.exe d:\Scratch\testfailure d:\Scratch\testfailure\zig-cache C:\Users\jcmoyer\AppData\Local\zig test

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
All 1 tests passed.
All 1 tests passed.

d:\Scratch\testfailure>zig build test
All 1 tests passed.
error: InvalidFormat
error: test...
error: The following command exited with error code 1:
D:\Scratch\zig-install\bin\zig.exe test D:\Scratch\testfailure\src\b.zig --cache-dir D:\Scratch\testfailure\zig-cache --global-cache-dir C:\Users\jcmoyer\AppData\Local\zig --name test --enable-cache
error: the following build command failed with exit code 1:
d:\Scratch\testfailure\zig-cache\o\6be072760b1c422c81d96f0d8413e4e5\build.exe D:\Scratch\zig-install\bin\zig.exe d:\Scratch\testfailure d:\Scratch\testfailure\zig-cache C:\Users\jcmoyer\AppData\Local\zig test

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
All 1 tests passed.
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.

d:\Scratch\testfailure>zig build test
LLD Link... warning(link): failed to write cache manifest when linking: LockViolation
All 1 tests passed.
error: InvalidFormat
error: test...
error: The following command exited with error code 1:
D:\Scratch\zig-install\bin\zig.exe test D:\Scratch\testfailure\src\b.zig --cache-dir D:\Scratch\testfailure\zig-cache --global-cache-dir C:\Users\jcmoyer\AppData\Local\zig --name test --enable-cache
error: the following build command failed with exit code 1:
d:\Scratch\testfailure\zig-cache\o\6be072760b1c422c81d96f0d8413e4e5\build.exe D:\Scratch\zig-install\bin\zig.exe d:\Scratch\testfailure d:\Scratch\testfailure\zig-cache C:\Users\jcmoyer\AppData\Local\zig test
```

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Windows cache corruption after repeatedly running tests #12664

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Uh oh!

Windows cache corruption after repeatedly running tests #12664

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