Backport#24528

This pull request includes updates to thebuild.psm1 file to add a new source option and various configuration files to update package source URLs. Additionally, there are improvements to thetools/findMissingNotices.ps1 script to handle missing registrations and version conversion.

Updates tobuild.psm1:

• AddedNuGetOnly to theValidateSet for the$Source parameter in theSwitch-PSNugetConfig function.
• Updated theSwitch-PSNugetConfig function to handle the newNuGetOnly source option.

Configuration updates:

• Updated the package source URL innuget.config to use the newPowerShell URL.
• Updated the package source URL insrc/Modules/nuget.config to use the newPowerShell URL.
• Updated the package source URL intest/tools/Modules/nuget.config to use the newPowerShell URL.

Improvements totools/findMissingNotices.ps1:

• Added a check to ensure that the registration table does not already contain the component name before adding it.
• Added a newConvertTo-SemVer function to handle version conversion and edge cases.