Add integration test for Get-SqlDscManagedComputerService command

[Copilot]

Creating integration test for Get-SqlDscManagedComputerService command to ensure command reliability.

Plan:

• Analyze existing code and repository structure
• Examine existing integration test patterns
• Understand the Get-SqlDscManagedComputerService command functionality
• Create integration test file following established patterns
• Test parameter set ByServerName scenarios
• Test parameter set ByManagedComputerObject scenarios
• Test service filtering by ServiceType
• Test service filtering by InstanceName
• Add test file to azure-pipelines.yml integration test group
• Run tests to validate functionality
• Update CHANGELOG.md
• Address PR feedback: fix error message, add blank line, update README.md

Implementation Details:

• Created tests/Integration/Commands/Get-SqlDscManagedComputerService.Integration.Tests.ps1 with comprehensive test coverage
• Tests validate all parameter combinations: ByServerName, ByManagedComputerObject, ServiceType filtering, InstanceName filtering
• Added integration test to azure-pipelines.yml in appropriate test group
• Updated CHANGELOG.md with proper entry documenting the addition
• Updated README.md with dependency information (run order 2, depends on Install-SqlDscServer and Prerequisites)
• Fixed error message to use 'noop' task instead of 'build'
• Added blank line at end of file per style guidelines
• All unit tests pass and syntax validation successful
• Integration tests use same CI infrastructure as other SQL Server management tests

Fixes #2219.

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