*: revert gRPC stream operation duration metrics (#11048)

[ti-chi-bot]

This is an automated cherry-pick of #11048

What problem does this PR solve?

Issue Number: close #11040

grpcutil.NewMetricsStream registers histogram children labeled by peer IP with no lifecycle cleanup. Long-running PD/MCS processes accumulate unbounded label series (observed ~840k series from ~18k historical IPs), inflating memory and /metrics scrape cost until scrapes fail.

What is changed and how does it work?

Revert the gRPC stream operation duration metrics introduced in #10254 and the dependent Grafana stream-send panels from #10339. This removes `grpcutil.MetricsStream` and the peer-IP-labeled `grpc_stream_operation_duration_seconds` histograms from PD and MCS services, eliminating the unbounded cardinality leak until a safer replacement lands.

Check List

Tests

• No code

Related changes

• Need to cherry-pick to the release branch

Release note

Revert gRPC stream operation duration metrics to fix unbounded peer-IP label cardinality.

Summary by CodeRabbit

• Bug Fixes
  • Removed gRPC stream send-duration metrics from server endpoints and Grafana dashboards.
  • Simplified streaming operations by eliminating the associated instrumentation layer.
  • Removed the unsupported gRPC receive error and related utility behavior.
  • Existing request handling and service functionality remain unchanged.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JmPotato, lhy1024

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• OWNERS [JmPotato,lhy1024]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-07-24 09:58:37.51829552 +0000 UTC m=+1571703.554390576: ☑️ agreed by JmPotato.
• 2026-07-24 10:13:48.198628681 +0000 UTC m=+1572614.234723727: ☑️ agreed by lhy1024.

[JmPotato]

/retest

[JmPotato]

/retest