feat: New Pattern Module avm/ptn/sa/customer-chatbot

[Rafi-Microsoft]

This pull request introduces a new "customer-chatbot" AVM module, including all necessary infrastructure, deployment automation, and repository configuration. The main changes add the module's Bicep templates, CI workflow, code ownership, and issue template support.

Key changes include:

1. New Module Addition:

• Added the initial version of the avm/ptn/sa/customer-chatbot module, including its Bicep templates for AI project provisioning, AI Foundry connections, and virtual network infrastructure. [1] [2] [3]
• Created a CHANGELOG.md for the new module with an initial entry.

2. CI/CD and Repository Integration:

• Introduced a dedicated GitHub Actions workflow (.github/workflows/avm.ptn.sa.customer-chatbot.yml) for building, validating, and deploying the new module.
• Updated .github/CODEOWNERS to assign ownership of the new module to the appropriate teams.
• Updated the AVM module issue template to include the new module as a selectable option.

Pipeline Reference

Pipeline
avm.ptn.sa.customer-chatbot

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• I have run Set-AVMModule locally to generate the supporting module files.
• My corresponding pipelines / checks run clean and green without any errors or warnings
• I have updated the module's CHANGELOG.md file with an entry for the next version

[matebarabas]

Note for the core team's initial review: the MAR record PR for this module has been submitted, awaiting approval.