[receiver/nginx] Add featuregate to emit 'nginx.connections_current' as a non-monotonic sum #21686
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The featuregate is called
receiver.nginx.emitConnectionsCurrentAsSum
.Since the intended change involves emitting the same metric with a different data type, it was necessary to temporarily introduce a dummy metric that could be swapped in place when the gate is enabled. This dummy metric is never actually emitted with its dummy name or description, but it does appear in autogenerated documentation.
Updates #4326