*: Change cpu usages related representation format

[yibin87]

What problem does this PR solve?

Issue Number: ref #55542

Problem Summary:
In #55455, we added tidb/tikv cpu usages into several system table. During document review process, we discussed the display details, and want to do some display changes: pingcap/docs-cn#18527. Mainly two points:

1. Use nanoseconds instead of seconds to display processlist's tidb/tikv cpu time
2. Change the slow log field names from tidb_cpu_usage to tidb_cpu_time, tikv_cpu_usage to tikv_cpu_time

The display will look like this:

What changed and how does it work?

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

[tiprow]

Hi @yibin87. Thanks for your PR.

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[yibin87]

/cc @xzhangxian1008 @windtalker

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.0877%. Comparing base (2842fcb) to head (a706e84).
Report is 27 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56044         +/-   ##
=================================================
- Coverage   72.8872%   57.0877%   -15.7995%     
=================================================
  Files          1604       1755        +151     
  Lines        446775     633346     +186571     
=================================================
+ Hits         325642     361563      +35921     
- Misses       101085     247034     +145949     
- Partials      20048      24749       +4701     

Flag	Coverage Δ
integration	39.7198% <33.3333%> (?)
unit	72.2134% <100.0000%> (+0.2098%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	64.3388% <ø> (+18.6215%)	⬆️

[windtalker]

LGTM

[xzhangxian1008]

LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-12 09:00:32.532109735 +0000 UTC m=+519702.272533674: ☑️ agreed by windtalker.
• 2024-09-12 09:11:52.581957914 +0000 UTC m=+520382.322381854: ☑️ agreed by xzhangxian1008.

[GMHDBJD]

LGTM

[yibin87]

/test check-dev2

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[yudongusa]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: GMHDBJD, windtalker, xzhangxian1008, yudongusa

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[yibin87]

/test unit-test

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[yibin87]

/retest

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[yibin87]

/test unit-test

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[hawkingrei]

/retest

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