br: revert backup progress

[Leavrth]

What problem does this PR solve?

Issue Number: ref #53778

Problem Summary:
get region counts for each range takes too much time when there are 1 million tables.

What changed and how does it work?

revert back to use range unit progress

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 @Leavrth. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 77.04918% with 14 lines in your changes missing coverage. Please review.

Project coverage is 74.7662%. Comparing base (1fa2955) to head (391c867).
Report is 23 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53914        +/-   ##
================================================
+ Coverage   73.1670%   74.7662%   +1.5992%     
================================================
  Files          1680       1695        +15     
  Lines        463042     463142       +100     
================================================
+ Hits         338794     346274      +7480     
+ Misses       103444      95317      -8127     
- Partials      20804      21551       +747     

Flag	Coverage Δ
integration	46.4577% <77.0491%> (?)

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

Components	Coverage Δ
dumpling	52.6910% <ø> (ø)
parser	∅ <ø> (∅)
br	61.6911% <77.0491%> (+15.6713%)	⬆️

[ti-chi-bot]

@Leavrth: 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/unit-test	391c867	link	true	/test unit-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer

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• br/OWNERS [3pointer]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-23 03:10:37.884872556 +0000 UTC m=+1444827.973675096: ☑️ agreed by 3pointer.