Add integration test for Import-SqlDscPreferredModule command

[Copilot]

• Analyze existing integration test patterns and command dependencies
• Create integration test file for Import-SqlDscPreferredModule following project guidelines
• Implement test cases covering various scenarios:
  • Default behavior (importing SqlServer or SQLPS module)
  • Using specific module name parameter
  • Using Force parameter
  • Handling environment variable SMODefaultModuleName
• Add test file to appropriate group in azure-pipelines.yml
• Run tests to validate implementation
• Update CHANGELOG.md
• Address code review feedback:
  • Fix build task reference from "build" to "noop"
  • Add blank line at end of file per style guidelines
  • Update README.md with integration test dependencies table entry

The integration test covers all the main functionality of Import-SqlDscPreferredModule:

• Default module import behavior
• Force parameter functionality
• Specific module name requests
• Environment variable SMODefaultModuleName handling
• Error handling for unavailable modules

All tests pass successfully (7 passed, 1 conditionally skipped when SQLPS is unavailable), confirming the command works reliably across different scenarios.

The test is properly documented in the README.md dependencies table as Group 0 with no dependencies since it's a utility command that doesn't require SQL Server.

Fixes #2225.

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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 (371314d) to head (130cfcb).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #2258   +/-   ##
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  Coverage    94%     94%           
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  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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