Backport of Fix multiple issues related to proxycfg health queries. into release/1.15.x #17268
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Backport
This PR is auto-generated from #17241 to be assessed for backporting due to the inclusion of the label backport/1.15.
The below text is copied from the body of the original PR.
The datacenter was not being provided to a proxycfg query, which resulted in bypassing agentless query optimizations and using the normal API instead.
The health rpc endpoint would return a zero index when insufficient ACLs were detected. This would result in the agent cache performing an infinite loop of queries in rapid succession without backoff.
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