WIP: statistics: use correct last update version

[0xPoe]

What problem does this PR solve?

Issue Number: ref https://github.com/pingcap/tidb/issues/50132

Problem Summary:

What changed and how does it work?

There are two versions here:

1. Version: The last stats update version(count and modify_count).
2. LastUpdateVersion: The last update time of the histogram. We can take it as the last analysis time.

We should use the second one here instead of the first one.

Check List

Tests

• [x] 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

[codecov[bot]]

Codecov Report

Merging #51287 (61520f7) into master (f4e758a) will decrease coverage by 16.1122%. Report is 2 commits behind head on master. The diff coverage is 100.0000%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #51287         +/-   ##
=================================================
- Coverage   70.6793%   54.5672%   -16.1122%     
=================================================
  Files          1460       1569        +109     
  Lines        434615     603432     +168817     
=================================================
+ Hits         307183     329276      +22093     
- Misses       108242     251231     +142989     
- Partials      19190      22925       +3735     

Flag	Coverage Δ
integration	36.6186% <ø> (?)
unit	70.3553% <100.0000%> (-0.1192%)	:arrow_down:

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.3955% <ø> (+5.5117%)	:arrow_up:

[0xPoe]

/retest

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, time-and-fate

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-02-26 06:03:32.865702133 +0000 UTC m=+855501.613325245: :ballot_box_with_check: agreed by hawkingrei.
• 2024-02-27 06:13:03.400284551 +0000 UTC m=+942472.147907662: :ballot_box_with_check: agreed by time-and-fate.