Remove GitHub Actions workflow for security compliance requirements

[arjenhuitema]

Overview/Summary

Due to security compliance requirements, we've made core changes that mean we no longer automatically build the policies, initiatives templates after changes are committed.

Updates will need to applied manually by running one or more of the following commands:

bicep build .\patterns\alz\templates\policies-Automation.bicep --outfile .\patterns\alz\policyDefinitions\policies-Automation.json
bicep build .\patterns\alz\templates\policies-Compute.bicep --outfile .\patterns\alz\policyDefinitions\policies-Compute.json
bicep build .\patterns\alz\templates\policies-Hybrid.bicep --outfile .\patterns\alz\policyDefinitions\policies-Hybrid.json
bicep build .\patterns\alz\templates\policies-KeyManagement.bicep --outfile .\patterns\alz\policyDefinitions\policies-KeyManagement.json
bicep build .\patterns\alz\templates\policies-Monitoring.bicep --outfile .\patterns\alz\policyDefinitions\policies-Monitoring.json
bicep build .\patterns\alz\templates\policies-Network.bicep --outfile .\patterns\alz\policyDefinitions\policies-Network.json
bicep build .\patterns\alz\templates\policies-NotificationAssets.bicep --outfile .\patterns\alz\policyDefinitions\policies-NotificationAssets.json
bicep build .\patterns\alz\templates\policies-RecoveryServices.bicep --outfile .\patterns\alz\policyDefinitions\policies-RecoveryServices.json
bicep build .\patterns\alz\templates\policies-ServiceHealth.bicep --outfile .\patterns\alz\policyDefinitions\policies-ServiceHealth.json
bicep build .\patterns\alz\templates\policies-Storage.bicep --outfile .\patterns\alz\policyDefinitions\policies-Storage.json
bicep build .\patterns\alz\templates\policies-Web.bicep --outfile .\patterns\alz\policyDefinitions\policies-Web.json
bicep build .\patterns\alz\templates\policySets.bicep --outfile .\patterns\alz\policyDefinitions\policySets.json

This PR fixes/adds/changes/removes

1. Removes the automation workflow.

Breaking Changes

None.

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• Ensured PR tests are passing
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[Brunoga-MS]

Approving based on the need to stop it because of MSRC case explained in the Workitem #37611