Add query for ala-1 to find subscriptions without service health alerts

[sebassem]

Overview/Summary

Adding a resource graph query that will return all subscriptions without Service Health alerts configured.

Related Issues/Work Items

Fixes #436

This PR fixes/adds/changes/removes

Fixes #436

Breaking Changes

N/A

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
• Performed testing and provided evidence (e.g. screenshot of output) for any changes associated to ARG queries and/or scripts
• Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)

[oZakari]

Thank you @sebassem, would you mind adding a screenshot of the query output please?

[sebassem]

Thank you @sebassem, would you mind adding a screenshot of the query output please?

Sure thing