Add Azure function to remove used subscriptions

[jfaurskov]

Overview/Summary

This PR includes code and pipeline to create an Azure function to cancel PR validation subscriptions once the PR has been closed. Described in this bug

This PR fixes/adds/changes/removes

1. The .github/azFunction directory with associated files.

Breaking Changes

N/A

Testing Evidence

Succesful pipeline run can be seen here

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
• (ALZ Bicep Core 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 one or more of the following tests (if required)
  • Unit
  • Linting
  • E2E (End-To-End)
  • ValidateAzCloud (Base validation in Azure Cloud)
  • ValidateMcCloud (Base validation in Azure China Cloud)
• Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Wiki Docs etc.)
• If relevant, created or updated Code Tours here

[jtracey93]

nice work, just a few nit picking bits 👍

[jfaurskov]

/azp run ValidateazCloud

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jtracey93]

nice stuff.

Just the linter error to fix. I dont think you need the plaintext bit specified. Worth testing without i think

[jtracey93]

@jfaurskov can you also remove the old github action in this repo that does the cancelling as part of this PR 👍

[jfaurskov]

/azp run ValidateazCloud

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jfaurskov]

/azp run ValidateazCloud

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).