fix: added dns for existing project to access

[AjitPadhi-Microsoft]

Purpose

• This pull request introduces improvements to the Azure infrastructure Bicep templates, focusing on enhanced networking security and code maintainability for AI service deployments. The most important changes are the addition of conditional private endpoint creation for existing AI services and a refactor to streamline AI model deployments.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

Golden Path Validation

• [ ] I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• [ ] I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information