[mono] Failing test ApplyUpdateTests.AsyncMethodChanges

[lambdageek]

(This is a test marked with an incorrect ActiveIssue - creating this one to track it separately, see #79044).

The test fails with:

        Mono: no implementation for interface method System.Runtime.CompilerServices.IAsyncStateMachine::MoveNext() in class System.Reflection.Metadata.ApplyUpdate.Test.AsyncMethodChange/<TestTaskMethod>d__1#1
        Mono: METHOD .ctor()
        Mono: METHOD MoveNext()
        Mono: METHOD SetStateMachine(System.Runtime.CompilerServices.IAsyncStateMachine)

It looks like we're not picking up the new async state machine's interface implementations from the hot reload delta.