Add integration test for Test-SqlDscIsRole command

[Copilot]

• Analyze repository structure and existing integration test patterns
• Identify the missing integration test for Test-SqlDscIsRole command
• Study existing similar tests (Test-SqlDscIsAgentOperator) and role-related tests pattern
• Understand build and test workflow requirements
• Create Test-SqlDscIsRole.Integration.Tests.ps1 following established patterns
• Add the new test file to appropriate pipeline group (Group 5 with other role tests)
• Verify the test follows SqlServerDsc guidelines and style requirements
• Run unit tests to ensure changes don't break existing functionality
• Update CHANGELOG.md with the addition
• Address review feedback:
  • Fix file ending with single blank line per guidelines
  • Change error message to reference 'noop' task instead of 'build'
  • Update README.md with Test-SqlDscIsRole dependency information

Review Feedback Addressed:

✅ File format compliance - Fixed file to end with single blank line per project guidelines
✅ Error message correction - Updated error message to reference correct 'noop' task
✅ Documentation update - Added Test-SqlDscIsRole to integration test dependencies table in README.md with:

• Run order: 2
• Dependencies: 1 (Install-SqlDscServer), 0 (Prerequisites)
• Instance: DSCSQLTEST
• Creates no persistent objects

The integration test provides comprehensive coverage for real-world SQL Server environments while leveraging the existing test infrastructure and shared test roles.

Fixes #2229.

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[johlju]

@johlju reviewed 2 of 3 files at r2, 2 of 2 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @copilot)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94%. Comparing base (371314d) to head (4c10269).
⚠️ Report is 61 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #2262   +/-   ##
====================================
  Coverage    94%     94%           
====================================
  Files       149     149           
  Lines      9163    9163           
====================================
  Hits       8687    8687           
  Misses      476     476           

Flag	Coverage Δ
unit	94% <ø> (ø)

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