Cherry-Picking more commits from main into dev

[TalZaccai]

No description provided.

[Copilot]

Pull request overview

This PR cherry-picks two improvements from the main branch into dev:

1. Test isolation improvement (TestUtils.cs): UnitTestWorkingDir() is simplified by removing the category and includeGuid parameters. Instead, it now automatically incorporates test arguments as a hash code, ensuring different parameterized test runs of the same method get separate working directories without requiring callers to pass extra arguments.

2. Dispose refactoring (MigrateSessionTaskStore.cs): The Dispose() method is updated so that session disposal happens outside the write lock. The flag _disposed is set while holding the lock to prevent concurrent add/remove operations from racing, and then sessions are disposed after the lock is released — this is safe because all other methods check _disposed early under the lock before accessing sessions.

Changes:

• Simplified UnitTestWorkingDir() in TestUtils.cs to use argument-based hash codes for parameterized test separation instead of optional category/includeGuid parameters.
• Refactored MigrateSessionTaskStore.Dispose() in MigrateSessionTaskStore.cs to set the disposed flag under a lock, then dispose sessions outside the lock.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
test/Garnet.test/TestUtils.cs	Removes category/includeGuid params; adds argument hashing for test directory isolation
libs/cluster/Server/Migration/MigrateSessionTaskStore.cs	Refactors Dispose() to release the write lock before iterating/disposing sessions; adds /// <inheritdoc/> tag

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