Add tests demonstrating lambda comment formatting issue is fixed

[Copilot]

Testing lambda formatting with comments (Issue #25010)

Comprehensive tests to verify that the formatting issue with comments in lambda expressions has been resolved:

• Explored repository structure and formatting test infrastructure
• Created test cases for lambda with comment formatting issue
• Built the test project successfully
• Ran tests - all 3 new tests pass, confirming the issue is fixed
• Verified no regressions in all 516 formatting tests
• Ran security checks (CodeQL) - no issues detected
• Verified tests match the exact issue description
• Updated WorkItem URLs to reference issue Reformatting does not consistently indent comment and succeeding statement #25010

Summary

The issue described in #25010 has been fixed. The tests demonstrate that:

1. Lambda expressions with comments now format correctly - Comments and subsequent statements maintain consistent indentation
2. No regressions - All 516 existing formatting tests continue to pass
3. Control test included - Verified that if-statements with comments format correctly (they were not affected by this issue)

Test Details

Three new tests were added to FormattingTests.cs:

1. LambdaWithCommentAndStatement - Tests the exact scenario from issue Reformatting does not consistently indent comment and succeeding statement #25010
2. LambdaWithMultipleCommentsAndStatements - Tests lambdas with multiple statements and comments
3. IfStatementWithCommentNotAffected - Control test showing if-statements work correctly

All tests verify that when code with improper indentation is formatted, the output has consistent and correct indentation for both comments and statements within lambda expressions.

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[CyrusNajmabadi]

@copilot update these urls to #25010

[Copilot]

Updated all three WorkItem URLs to reference issue #25010 in commit 2e7dd28.