*: Check sqlkiller status during split region process

[yibin87]

What problem does this PR solve?

Issue Number: close #55957

Problem Summary:
In 8.1 and earlier versions, during building cop tasks, tidb needs to split key ranges. Tidb may use rpc to connect pd to get latest region info one by one, and this will cost too much time if tidb needs to load many regions' info. Even worse, tidb won't check the sqlkiller signal during this process, so the query won't be killed until the spliting key ranges work is done.

What changed and how does it work?

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.

Fix the issue that query won't be killed during building coprocessor tasks process.

[tiprow]

Hi @yibin87. Thanks for your PR.

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[yibin87]

/cc @windtalker

[windtalker]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-8.1@e0bef39). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #56155   +/-   ##
================================================
  Coverage               ?   71.1774%           
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  Files                  ?       1466           
  Lines                  ?     423102           
  Branches               ?          0           
================================================
  Hits                   ?     301153           
  Misses                 ?     101440           
  Partials               ?      20509           

Flag	Coverage Δ
unit	71.1774% <100.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9656% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	41.3149% <0.0000%> (?)

[yibin87]

/cc @wshwsh12

[yibin87]

/cc @xzhangxian1008

[xzhangxian1008]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: windtalker, xzhangxian1008

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-19 07:22:46.235172353 +0000 UTC m=+1118635.975596291: ☑️ agreed by windtalker.
• 2024-09-19 08:32:23.222191475 +0000 UTC m=+1122812.962615414: ☑️ agreed by xzhangxian1008.

[yibin87]

/cherrypick release-7.5

[ti-chi-bot]

@yibin87: new pull request created to branch release-7.5: #56159.

In response to this:

/cherrypick release-7.5

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