Stabilize memory, probe improvements, profile-soft-delete.

Repo:

• Moved docs to their own folder

Policy:

• Added x-ms-client-request-id to help debug with OpenAI in the future
• copy back policy from stream version, disabled streaming
• Retry if the endpoint returns a 200 with content-length = 0

Proxy:

• Warning: Fix compiler warnings
• Don't report the service as "UP" until the userProfile is loaded
• UserConfigRequired triggers health check to fail if profiles are not loaded
• Implemented soft-delete for user profiles with alert if request received for a soft-deleted profile
• Streamlined health probes
• Don't force the HTTP connection to close to backend after each request
• Add /ForceGC to force GC
• Add memory details to /health
• Memory use improvements: Reuse proxy event objects throughout, pre-allocate size, EventHub client batch cleanup, stream response body rather than copy it.
• Bug fixes for when app insights and EventHub are disabled