Add integration test for Get-SqlDscPreferredModule command

[Copilot]

• Analyze repository structure and existing integration test patterns
• Verify build environment and functionality
• Confirm Get-SqlDscPreferredModule unit tests pass
• Verify SqlServer module availability in CI environment
• Create integration test file following established patterns
• Add comprehensive test scenarios for real environment
• Test with available modules in CI environment
• Add test to appropriate group in azure-pipelines.yml
• Update CHANGELOG.md
• Address PR feedback: fix task reference and update README

PR Feedback Addressed:

• Fixed task reference from 'build' to 'noop' in error message
• Added Get-SqlDscPreferredModule to README.md dependencies table with correct run order and dependencies
• Ensured file ends with proper newline formatting

Successfully created comprehensive integration test for Get-SqlDscPreferredModule command that:

• Tests all major functionality in real environment with actual modules
• Validates default parameter behavior and module discovery
• Tests Name parameter with various scenarios
• Verifies Refresh parameter functionality
• Tests environment variable handling (SMODefaultModuleName, SMODefaultModuleVersion)
• Validates proper error handling for missing modules
• Ensures correct output types and properties
• Includes appropriate integration tags for CI pipeline
• Added to Group 2 in azure-pipelines.yml for proper test execution

All tests pass successfully with 15 comprehensive test scenarios covering edge cases and real-world usage.

Fixes #2218.

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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 (5140c6a).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #2251   +/-   ##
====================================
  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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