[watch] Fix /bl option parsing, use it for build logging

[tmat]

The option is now forwarded to the command dotnet-watch is executing (dotnet run, dotnet test, etc.) and also used for logging dotnet-watch invoked build operations: dotnet build and design-time build.

[Copilot]

Pull Request Overview

This PR fixes the parsing of the /bl (binary logger) option in dotnet-watch and enables proper build logging functionality. The changes address issues with how binary logger arguments were handled and ensure consistent logging across different build operations.

Key changes:

• Fixed binary logger option parsing to handle various /bl formats correctly
• Updated all BuildReporter instantiations to accept GlobalOptions parameter for binary logging configuration
• Added proper binary log file filtering to prevent watch loops on generated log files

Reviewed Changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
CommandLineOptions.cs	Added binary logger option parsing and forwarding logic with proper MSBuild argument formatting
GlobalOptions.cs	Added BinaryLogPath property to store binary logger configuration
EnvironmentOptions.cs	Modified GetBinLogPath method to use GlobalOptions instead of test-specific logic
BuildReporter.cs	Updated constructor to accept GlobalOptions parameter for binary logging
Multiple test files	Updated BuildReporter instantiations to include new GlobalOptions parameter
HotReloadDotNetWatcher.cs	Added binary log file filtering and removed hardcoded test binary log arguments
WatchableApp.cs	Updated default watch arguments to use simpler -bl format

Comments suppressed due to low confidence (2)

test/dotnet-watch.Tests/CommandLine/EnvironmentOptionsTests.cs:6

• The class name 'BuildReporterTests' doesn't match the file name 'EnvironmentOptionsTests.cs'. Either rename the class to 'EnvironmentOptionsTests' or move it to a file named 'BuildReporterTests.cs'.

public class BuildReporterTests

src/BuiltInTools/dotnet-watch/CommandLine/CommandLineOptions.cs:264

• There's an extra closing brace here that doesn't match the opening structure, creating unbalanced braces in the control flow.

                }

[tmat]

@baronfel ptal