copIterator: return context error to avoid return incorrect result on context cancel/timeout (#53489)

[ti-chi-bot]

This is an automated cherry-pick of #53489

What problem does this PR solve?

Issue Number: close #50089 #55500

Problem Summary:

What changed and how does it work?

always return context error when recvFromRespCh return closed=true

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

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-19 08:55:57.202496203 +0000 UTC m=+169352.336946323: ☑️ agreed by D3Hunter.
• 2024-08-19 09:08:01.560421147 +0000 UTC m=+170076.694871268: ☑️ agreed by lance6716.

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@f440415). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.1     #55499   +/-   ##
================================================
  Coverage               ?   71.1773%           
================================================
  Files                  ?       1466           
  Lines                  ?     422702           
  Branches               ?          0           
================================================
  Hits                   ?     300868           
  Misses                 ?     101336           
  Partials               ?      20498           

Flag	Coverage Δ
unit	71.1773% <72.7272%> (?)

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	41.3082% <0.0000%> (?)

[crazycs520]

/merge

[ti-chi-bot]

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[crazycs520]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crazycs520, D3Hunter, lance6716, tangenta

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Needs approval from an approver in each of these files:

• OWNERS [D3Hunter,crazycs520,lance6716,tangenta]
• pkg/ddl/OWNERS [tangenta]
• pkg/disttask/OWNERS [D3Hunter,lance6716,tangenta]

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[D3Hunter]

/retest