fix: added dns for existing project to access

[AjitPadhi-Microsoft]

Purpose

• This pull request introduces improvements to the deployment of private networking resources for AI services in the infra/main.bicep file. The main focus is on simplifying the logic for private DNS zone deployment and adding support for private endpoints when using existing AI Foundry AI projects.

Private Networking Enhancements:

• Simplified the condition for deploying private DNS zones by removing checks related to existing AI Foundry AI projects and zone indices, ensuring all zones are deployed when private networking is enabled.

Support for Existing AI Foundry AI Projects:

• Added a new module to provision a private endpoint for existing AI Foundry AI services when private networking is enabled, including configuration for DNS zone groups and network interface naming.

Does this introduce a breaking change?

• [ ] Yes
• [x] No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

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