Add MSTEST0070 member name edge-case tests

[Amaury Levé (Evangelink)]

Summary

• cover empty member names in MemberConditionShouldBeValidAnalyzer
• cover whitespace-only member names
• cover an empty member name after a valid entry in the params array
• stabilize the unrelated Windows net462 cancellation test exposed by CI by replacing its timer race with explicit cancellation

Validation

• all 28 MemberConditionShouldBeValidAnalyzerTests pass
• targeted CancellationAsyncWithReturnValue_ObserveException_Succeeds passes on net462
• the cancellation test passes 10 consecutive net462 runs

Fixes#10026

[Copilot]

Pull request overview

Adds MSTEST0070 regression coverage for member names ignored by the analyzer because runtime validation handles them.

Changes:

• Tests empty and whitespace-only member names.
• Tests an empty name within the additional params array.
• Verifies all cases produce no analyzer diagnostic.

Show a summary per file

File	Description
test/UnitTests/MSTest.Analyzers.UnitTests/MemberConditionShouldBeValidAnalyzerTests.cs	Adds three edge-case analyzer tests.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Medium

[Copilot]

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Medium

[github-actions]

Test quality grade - PR #10031

Grade	Test	Notes
A (90-100)	mod TaskExtensionsTests. CancellationAsyncWithReturnValue_ ObserveException_ Succeeds	Exception assertion + token equality + sync verification; pragma-only change preserves an already solid test.

_{This advisory comment was generated automatically. Grades are heuristic and informational - they do not block merging. Re-run with /grade-tests.}

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