opentelemetry-exporter-otlp-proto-http: fix metric self-observability over-count on batch split#5370

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open-telemetry:mainopen-telemetry/opentelemetry-python:mainfrom

Krishnachaitanyakc:fix/otlp-http-metrics-split-num-itemsKrishnachaitanyakc/opentelemetry-python:fix/otlp-http-metrics-split-num-itemsCopy head branch name to clipboard