Implement IMultiThreadableTask for Move task

[Copilot]

Context

Mirrors PR #12914 which migrated Copy, Delete, MakeDir, RemoveDir, and Touch tasks to use the thread-safe task API. Path.GetFullPath() uses process-global CWD state which is unsafe when tasks run in parallel. TaskEnvironment.GetAbsolutePath() provides thread-safe path resolution via the task's execution context.

Changes Made

src/Tasks/Move.cs:

• Add [MSBuildMultiThreadableTask] attribute and IMultiThreadableTask interface
• Add TaskEnvironment property
• Change MoveFileWithLogging and MakeWriteableIfReadOnly to accept AbsolutePath instead of string
• Resolve paths via TaskEnvironment.GetAbsolutePath() in Execute(), with calls placed inside the try block using nullable AbsolutePath? to preserve original error handling behavior (log error and continue with other inputs)
• Use sourceFile?.OriginalValue ?? sourceSpec for LockCheck.GetLockedFileMessage call to safely handle null sourceFile in catch block

src/Tasks.UnitTests/Move_Tests.cs:

• Add TaskEnvironmentHelper.CreateForTest() to all 20 Move task instantiations

Testing

All 18 applicable Move tests pass. 5 tests skipped (Windows/.NET Framework only).

Notes

Pattern matches existing implementations in Copy.cs, Delete.cs, MakeDir.cs, RemoveDir.cs, Touch.cs. The GetAbsolutePath calls are placed inside the try block (similar to Delete.cs) to ensure that any ArgumentException from null/empty paths is caught and logged, allowing the task to continue processing remaining files. The null-coalescing pattern for LockCheck.GetLockedFileMessage is consistent with the approach used in Delete.cs and MakeDir.cs.

Original prompt

Look at what happened in this Pull request with the tasks: #12914

Do the same for the "Move" task, preserve correctness, performance and validate tests pass

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[dotnet-policy-service]

Hello @@copilot, I noticed that you’re changing an .swr file or any file under src/Package/MSBuild.VSSetup.. Please make sure to validate this change by an experimental VS insertion. This is accomplished by pushing to an exp/* branch, which requires write permissions to this repo.

[Copilot]

Pull request overview

This pull request implements the IMultiThreadableTask interface for the Move task, enabling thread-safe execution in parallel build scenarios by replacing process-global Path.GetFullPath() calls with thread-safe TaskEnvironment.GetAbsolutePath(). This mirrors the changes made in PR #12914 for Copy, Delete, MakeDir, RemoveDir, and Touch tasks.

Changes:

• Modified Move task to implement IMultiThreadableTask and use TaskEnvironment for thread-safe path resolution
• Updated Move task tests to initialize TaskEnvironment for test execution
• Maintained backward compatibility by using OriginalValue for logging user-visible paths

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Tasks/Move.cs	Added IMultiThreadableTask interface, TaskEnvironment property, and converted MoveFileWithLogging and MakeWriteableIfReadOnly to accept AbsolutePath instead of string
src/Tasks.UnitTests/Move_Tests.cs	Added TaskEnvironment initialization to 20 Move task instantiations in test methods

fixed the objection