Add integration test for Set-SqlDscTraceFlag command

[Copilot]

• Analyze existing Set-SqlDscTraceFlag command and related functions
• Create integration test file for Set-SqlDscTraceFlag following project patterns
• Test setting trace flags on SQL Server instance
• Test clearing trace flags (empty array)
• Test error scenarios and validation
• Test pipeline input for ServiceObject parameter
• Test WhatIf parameter functionality
• Add test to azure-pipelines.yml in Group 2 (alongside other configuration tests)
• Test and validate all functionality
• Update CHANGELOG.md with integration test addition
• Address PR feedback: fix noop task reference, add blank line, update README dependency

Successfully implemented integration test for Set-SqlDscTraceFlag command covering:

• Setting single and multiple trace flags
• Replacing existing trace flags with new ones
• Clearing all trace flags using empty array
• WhatIf parameter functionality testing
• ServiceObject parameter testing via pipeline and direct parameter
• Proper setup/teardown with SQL Server service management
• Restoration of original trace flags after testing

PR Feedback Addressed:

• Fixed error message to reference 'noop' task instead of 'build'
• Added blank line at end of file per project guidelines
• Updated README.md with Set-SqlDscTraceFlag dependency information in Group 2

The test follows project conventions and is added to Group 2 in azure-pipelines.yml alongside other configuration-related tests like Set-SqlDscConfigurationOption.

Fixes #2232.

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