stats: use GetColOriginDefaultValue to get default value of a column

[YangKeao]

What problem does this PR solve?

Issue Number: close #60194

Problem Summary:

What changed and how does it work?

Fix the issue that the HandleDDLEvent cannot handle timezone issues properly.

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.

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[0xPoe]

Thanks!

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, Rustin170506

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Needs approval from an approver in each of these files:

• OWNERS [Defined2014,Rustin170506]
• pkg/statistics/OWNERS [Rustin170506]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-04-08 10:00:52.561212248 +0000 UTC m=+2164146.245448345: ☑️ agreed by Defined2014.
• 2025-04-08 10:10:14.12586271 +0000 UTC m=+2164707.810098790: ☑️ agreed by Rustin170506.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.7796%. Comparing base (1cd3943) to head (af4cca7).
Report is 6 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #60438        +/-   ##
================================================
+ Coverage   73.1105%   73.7796%   +0.6691%     
================================================
  Files          1711       1741        +30     
  Lines        473248     483704     +10456     
================================================
+ Hits         345994     356875     +10881     
+ Misses       105966     104784      -1182     
- Partials      21288      22045       +757     

Flag	Coverage Δ
integration	45.7428% <100.0000%> (?)
unit	72.3278% <100.0000%> (-0.0023%)	⬇️

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

Components	Coverage Δ
dumpling	52.6553% <ø> (ø)
parser	∅ <ø> (∅)
br	47.2229% <ø> (-0.0139%)	⬇️

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[Defined2014]

/retest

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #60439.
But this PR has conflicts, please resolve them!