Update cop rpc execution info

[yibin87]

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What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):
  In *: add rpc error stats and refine log for diagnose tidb#53335, cop tasks' rpc info execution summary was updated, while the documentation is not.

Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[zimulala]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-13 00:24:20.819861241 +0000 UTC m=+745204.108692950: ☑️ agreed by hfxsd.
• 2025-01-13 02:14:44.640466173 +0000 UTC m=+751827.929297878: ☑️ agreed by zimulala.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #19527.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19528.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #19529.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #19530.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19531.