Add integration test for Enable-SqlDscAudit command

[Copilot]

• Analyze repository structure and existing audit command integration tests
• Understand Enable-SqlDscAudit command structure and parameters
• Review existing Remove-SqlDscAudit integration test as template
• Setup build environment
• Create Enable-SqlDscAudit.Integration.Tests.ps1 file
• Implement integration tests for ServerObject parameter set
• Implement integration tests for AuditObject parameter set
• Implement pipeline input tests
• Test with Force and Refresh parameters
• Verify test file syntax and structure
• Add test file to CI pipeline configuration
• Update CHANGELOG.md with the change
• Fix PSScriptAnalyzer warnings with appropriate suppressions
• Address PR feedback:
  • Updated error message to use 'noop' task instead of 'build'
  • Removed Start-Service call (service already started)
  • Removed Stop-Service call (service should remain started)
  • Fixed file ending with proper blank line
  • Added Enable-SqlDscAudit to README.md dependency table
• Verify final integration

Summary:
Added comprehensive integration tests for the Enable-SqlDscAudit command covering:

• ServerObject and AuditObject parameter sets
• Pipeline input scenarios
• Force and Refresh parameters
• Error handling for non-existent audits
• Multiple audit operations
• Proper cleanup and teardown

The integration test follows the updated patterns used by other command integration tests in the repository and addresses all feedback provided in the code review.

Fixes #2223.

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94%. Comparing base (52e707f) to head (35d8b33).
⚠️ Report is 22 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #2252   +/-   ##
====================================
  Coverage    94%     94%           
====================================
  Files       149     149           
  Lines      9163    9163           
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  Hits       8687    8687           
  Misses      476     476           

Flag	Coverage Δ
unit	94% <ø> (ø)

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