Fix OrchestrationAPI status

[joelhulen]

Fix OrchestrationAPI status

The issue or feature being addressed

Fixes the 500 error that the OrchestrationAPI was returning, plus improves status reporting.

Details on the issue fix or feature implementation

Improves the status endpoint approach as follows:

• Changes the status_url property to status_endpoint and stores the relative path instead of a full URL that repeats the base URL.
• Extends the HttpClient to store and retrieve the status endpoint for easy access where needed in the backend services.
• Updates the Configuration resource provider templates accordingly.
• Improves obtaining and displaying the status of subordinate services for an API Configuration resource.

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• I started this PR by branching from the head of the default branch
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• This PR needs to be cherry-picked into at least one release branch
• I have included unit tests for the issue/feature
• I have included inline docs for my changes, where applicable
• I have successfully run a local build
• I have provided the required update scripts, where applicable
• I have updated relevant docs, where applicable

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