session: make TestUpgradeWithPauseDDL stable

[zimulala]

What problem does this PR solve?

Issue Number: close #46388

Problem Summary:
The job may be pausing, we only check it uses paused.

What is changed and how it works?

• Using pausing or paused to check whether the job is pausing.
• Extract the function of checkDDLJobState from the same two pieces of judgment code.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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

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[hawkingrei]

/ok-to-test

[codecov]

Codecov Report

Merging #46692 (7c9ec4f) into master (db570ea) will decrease coverage by 0.6578%.
Report is 17 commits behind head on master.
The diff coverage is 62.7907%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #46692        +/-   ##
================================================
- Coverage   73.3586%   72.7009%   -0.6578%     
================================================
  Files          1315       1339        +24     
  Lines        395675     402453      +6778     
================================================
+ Hits         290262     292587      +2325     
- Misses        86932      91346      +4414     
- Partials      18481      18520        +39     

Flag	Coverage Δ
integration	25.4020% <11.6279%> (?)
unit	73.3872% <62.7907%> (+0.0285%)	⬆️

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

Components	Coverage Δ
dumpling	54.0444% <ø> (ø)
parser	84.9689% <ø> (+0.0108%)	⬆️
br	48.1484% <ø> (-4.2891%)	⬇️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-05 14:20:29.213781624 +0000 UTC m=+2455193.762797608: ☑️ agreed by hawkingrei.
• 2023-09-06 03:31:08.053072501 +0000 UTC m=+2502632.602088488: ☑️ agreed by Defined2014.