Implement admin components of az-isolated-service-single-region template.

[nmiodice]

All Submissions:

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• [YES] Have you followed the guidelines in our Contributing document?
• [YES] Have you added an explanation of what your changes do and why you'd like us to include them?
• [NO] I have updated the documentation accordingly.
• [YES] I have added tests to cover my changes.
• [YES] All new and existing tests passed.
• [YES] My code follows the code style of this project.
• [YES] I ran lint checks locally prior to submission.
• [YES] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

What is the current behavior?

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No template exists for az-isolated-service-single-region

Issue Number: #188

What is the new behavior?

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az-isolated-service-single-region template partially implemented. The template should include the resources called out in the design that are deployed to subscription #1.

Does this introduce a breaking change?

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• [NO]

Any relevant logs, error output, etc?

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• 2 Deployed Apps w/ Staging Slots
  

• App Service Plan deployed to ASE
  

Notes

• There is a follow on PR to handle the scenario where Isolated app services can take > 1 hour to deploy

[erikschlegel]

This looks great! 🚀 Especially like how you're leveraging azurem providers to manage the multi-target subscriptions for this template.