[dbnode] Add metrics for remote aggregator client and downsampler #2165
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What this PR does / why we need it:
Previously since metrics collided on registration the remote aggregator client and other downsampler metrics were not being recorded. This ensures that if a metric registration collision occurs a log will be printed.
Also adding an end to end aggregator dashboard for debugging metric flows.
Special notes for your reviewer:
Does this PR introduce a user-facing and/or backwards incompatible change?:
Does this PR require updating code package or user-facing documentation?: