ddl, metrics: move temp index op metrics to separate panel

[joechenrh]

What problem does this PR solve?

Issue Number: ref #63209

Problem Summary:

What changed and how does it work?

Since the "Backfill Progress" panel is used to show the progress (in percentage) of reorg jobs. It's a bit strange to add temp index ops in this panel. So I separate those metrics into a new panel.

Besides, I asked AI to refactor the collector to make the code clearer.

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.

Import the json file in this PR and run add index.

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]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Needs approval from an approver in each of these files:

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[tiprow]

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[codecov]

Codecov Report

❌ Patch coverage is 96.70330% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.6576%. Comparing base (d863a63) to head (9e2ebde).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65501        +/-   ##
================================================
+ Coverage   78.3437%   78.6576%   +0.3138%     
================================================
  Files          1941       1910        -31     
  Lines        535546     532902      -2644     
================================================
- Hits         419567     419168       -399     
+ Misses       114459     112306      -2153     
+ Partials       1520       1428        -92     

Flag	Coverage Δ
integration	48.2880% <ø> (+0.0849%)	⬆️
unit	76.7692% <96.7033%> (+0.2673%)	⬆️

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

Components	Coverage Δ
dumpling	56.6191% <ø> (ø)
parser	∅ <ø> (∅)
br	60.0121% <ø> (-4.7665%)	⬇️

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[joechenrh]

/retest

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@joechenrh: 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/check_dev	9e2ebde	link	true	/test check-dev

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