Fix for Remove NuGet Source steps (now with enhanced logging)

[gladjohn]

Fix for Remove NuGet Source steps (now with enhanced logging)

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Description

Fix -

• The updated script checked if nuget.config exists before using it.
• If it was missing, it used the global NuGet config instead.

This pull request includes changes to the build/template-restore-build-MSIdentityWeb.yaml file to improve the handling of NuGet sources in the build process. The key changes focus on adding checks for the existence of a nuget.config file, enhancing logging, and ensuring robust handling of NuGet source addition and removal.

Improvements to NuGet source handling:

• Added a check for the existence of nuget.config and appropriate logging messages to inform whether the file was found or not.
• Enhanced logging to list existing NuGet sources before making any changes, and to confirm the successful addition or removal of NuGet sources.
• Implemented conditional logic to use nuget.config if it exists for adding and removing NuGet sources, ensuring the correct configuration file is used.
• Added error handling to exit the script if the removal or addition of a NuGet source fails, ensuring the build process does not proceed with incorrect configurations.

Fixes #3264

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Summary

Summary

Generated on:	2/26/2025 - 1:12:45 AM
Coverage date:	2/26/2025 - 1:12:00 AM - 2/26/2025 - 1:12:42 AM
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