infoschema,metrics: use tidb_tikvclient_request_seconds_bucket to get the .999 cop req duration instead (#59845)

[ti-chi-bot]

This is an automated cherry-pick of #59845

What problem does this PR solve?

Issue Number: Ref #59815

Problem Summary:
The TiDB -> Distsql -> Coprocessor Seconds 999 panel uses the tidb_tikvclient_cop_duration_seconds_bucket metric to gather data, but this metric is redundant. We can use tidb_tikvclient_request_seconds_bucket to obtain the same data. Therefore, tidb_tikvclient_cop_duration_seconds_bucket can be removed to save storage space.

client-go PR tikv/client-go#1602

What changed and how does it work?

Before:

After:

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/mysql-test	82008bc	link	true	/test mysql-test

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #60392   +/-   ##
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  Hits                   ?     301954           
  Misses                 ?     101534           
  Partials               ?      20550           

Flag	Coverage Δ
unit	71.2091% <ø> (?)

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Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.4206% <0.0000%> (?)

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