feat: Add evaluationDelay paramter for Deploy-Private-DNS-Generic policy

[Springstone]

Overview/Summary

This pull request primarily introduces changes in the Deploy-Private-DNS-Generic policy and updates the Whats-new.md documentation accordingly. The main update is the addition of an evaluationDelay parameter to the policy, which allows for a delay in the evaluation of the policy. This change is reflected in both the policy definition and the policy rule.

Updates to Deploy-Private-DNS-Generic policy:

• src/resources/Microsoft.Authorization/policyDefinitions/Deploy-Private-DNS-Generic.json: Added a new parameter evaluationDelay to the policy definition. This allows for a delay in the evaluation of the policy. The default value for this parameter is "PT10M".
• src/resources/Microsoft.Authorization/policyDefinitions/Deploy-Private-DNS-Generic.json: Updated the policy rule to include the evaluationDelay parameter.

Documentation update:

• docs/wiki/Whats-new.md: Updated the description of the Deploy-Private-DNS-Generic policy in the "This release includes:" section to include the new feature of supporting the configuration of the evaluation delay.

This PR fixes/adds/changes/removes

1. Adding EvaluationDelay to Deploy-Private-DNS-Generic

Breaking Changes

1. N/A

Testing Evidence

Please provide any testing evidence to show that your Pull Request works/fixes as described and planned (include screenshots, if appropriate).

Testing URLs

Azure Public

As part of this Pull Request I have

• [ ] Checked for duplicate Pull Requests
• [ ] Associated it with relevant issues, for tracking and closure.
• [ ] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [ ] Performed testing and provided evidence.
• [ ] Ensured contribution guidance is followed.
• [ ] Updated relevant and associated documentation.
• [ ] Updated the "What's New?" wiki page (located: /docs/wiki/whats-new.md)