WAF compliancy patch for adding DDoS protection plan

[yahanda]

Overview/Summary

Adding DDoS network protection option to be completely WAF compliant as per ADO Items below:
https://dev.azure.com/CSUSolEng/Accelerator%20-%20AVD/_workitems/edit/34480/
https://dev.azure.com/CSUSolEng/Accelerator%20-%20AVD/_workitems/edit/34047/

This PR fixes/adds/changes/removes

1. The DDoS network protection is not enabled by default. We can include in the accelerator the option to enable DDoS protection on the Vnet.

Breaking Changes

1. Replace me
2. Replace me

Testing Evidence

Tested from the link below
https://portal.azure.com/#blade/Microsoft_Azure_CreateUIDef/CustomDeploymentBlade/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fyahanda%2Favdaccelerator-bicep-edits%2Fwaf-compliancy-patch-3%2Fworkload%2Farm%2Fdeploy-baseline.json/uiFormDefinitionUri/https%3A%2F%2Fraw.githubusercontent.com%2Fyahanda%2Favdaccelerator-bicep-edits%2Fwaf-compliancy-patch-3%2Fworkload%2Fportal-ui%2Fportal-ui-baseline.json

Added checkbox for DDoS network protection

Deployed successfully

Successfully added DDoS protection plan on vnet

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues
• (AVD LZA Team Only) Associated it with relevant ADO Items
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Performed testing and provided evidence.
• Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Docs etc.)