chore: Azd changes Dev to Main

[NirajC-Microsoft]

This pull request updates version requirements for the Azure Developer CLI (azd) across configuration and documentation files. The changes ensure compatibility with azd version 1.15.0 or higher.

Updates to version requirements:

• azure.yaml: Added a requiredVersions field specifying that azd version 1.15.0 or higher is required.
• docs/DeploymentGuide.md: Updated the Azure Developer CLI (azd) installation instructions to specify version 1.15.0 or higher.## Purpose

• ...

Does this introduce a breaking change?

• Yes
• 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

• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information

[github-actions]

🎉 This PR is included in version 1.6.0 🎉

The release is available on GitHub release

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