Onboard Maven restores to CFS

[Ahmed Muhsin (ahmedmuhsin)]

Summary

• Route Maven dependency and plugin restores through the upstream-public CFS feed in every tracked POM.
• Install the repository Maven mirror and authenticate it before every CI Maven entry point.
• Add local credential-provider helpers for ingesting uncached packages.

This follows the Maven onboarding pattern from Azure/azure-functions-openai-extension#218.

Validation

• Authenticated CFS mvn clean package -DskipTests -Dmaven.javadoc.skip=true
• Parsed all nine tracked POMs and verified their dependency and plugin repositories use CFS
• Verified Maven setup ordering in all seven CI job templates
• Exercised the PowerShell credential-provider bootstrap using a disposable Maven repository
• Validated PowerShell and Bash helper syntax