server: split cursor test

[hawkingrei]

What problem does this PR solve?

Issue Number: close #50682

Problem Summary:

What changed and how does it work?

Actually, there are many test issues in TiDB, but because there are sequence-related problems before the tests, and in the original tests, the tests are too many and the capacity of shard_count has been consumed. Therefore, we have to split a new package to avoid conflicts between tests. At the same time, this approach can also make use of cache to speed up.

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

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [Defined2014,YangKeao]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-24 04:32:34.454893294 +0000 UTC m=+935196.019190994: ☑️ agreed by YangKeao.
• 2024-01-24 04:36:02.672366656 +0000 UTC m=+935404.236664358: ☑️ agreed by Defined2014.

[codecov]

Codecov Report

Merging #50683 (82226a1) into master (8e5d98d) will decrease coverage by 14.6981%.
Report is 3 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50683         +/-   ##
=================================================
- Coverage   70.3551%   55.6570%   -14.6981%     
=================================================
  Files          1456       1567        +111     
  Lines        420737     588448     +167711     
=================================================
+ Hits         296010     327513      +31503     
- Misses       104400     238146     +133746     
- Partials      20327      22789       +2462     

Flag	Coverage Δ
integration	36.7637% <ø> (?)
unit	70.2618% <ø> (-0.0816%)	⬇️

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

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	56.6008% <ø> (+6.0699%)	⬆️