[Performance] Do not construct `KeyValueIterable` when calling OTel for instruments with empty label/optional label (#37311)

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This seems to cut ~5 nanoseconds (10%) off of the `BM_AddCounterWithOTelPlugin` benchmark.

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Closes #37311

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37311 from yijiem:otel-metrics-benchmark 2f8c975cfc
PiperOrigin-RevId: 658915810

pull/37331/head

Yijie Ma 6 months ago committed by Copybara-Service

parent 116bcb46ee

commit ecc1ea512e

1 changed files with 73 additions and 42 deletions

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