executor, tests: move test cases from union_scan_test.go and kv_test.go to integrationtest

[Defined2014]

What problem does this PR solve?

Issue Number: ref #47076

Problem Summary: move 8 test cases.

What is changed and how it works?

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 @Defined2014. Thanks for your PR.

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[codecov]

Codecov Report

Merging #47659 (ffde4bd) into master (476d9b3) will increase coverage by 0.8934%.
Report is 4 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #47659        +/-   ##
================================================
+ Coverage   71.9335%   72.8270%   +0.8934%     
================================================
  Files          1396       1419        +23     
  Lines        404732     411151      +6419     
================================================
+ Hits         291138     299429      +8291     
+ Misses        94000      92880      -1120     
+ Partials      19594      18842       -752     

Flag	Coverage Δ
integration	41.3475% <ø> (?)
unit	71.9245% <ø> (-0.0090%)	⬇️

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

Components	Coverage Δ
dumpling	53.9913% <ø> (ø)
parser	∅ <ø> (∅)
br	48.6617% <ø> (-4.2547%)	⬇️

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [YangKeao,hawkingrei]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-16 07:57:27.361451812 +0000 UTC m=+1643844.948561958: ☑️ agreed by hawkingrei.
• 2023-10-16 08:17:04.993108495 +0000 UTC m=+1645022.580218632: ☑️ agreed by YangKeao.

[Defined2014]

/test mysql-test

[tiprow]

@Defined2014: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test mysql-test

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