fix(bigtable): add handling for gauge metrics #2719
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Field points[0].interval.start_time had an invalid value of "2025-11-25T11:10:06.164418-08:00": The start time must be equal to the end time (2025-11-25T11:11:06.164633-08:00) for the gauge metric 'bigtable.googleapis.com/internal/client/grpc/subchannel/open_connections'