test: fix flaky test TestSyncJobSchemaVerLoop

[D3Hunter]

What problem does this PR solve?

Issue Number: close #53508

Problem Summary:

What changed and how does it work?

the require.Zero(t, jobNodeVersionCnt()) check might fail if the loop cancelled before it receive the last DELETE event. it does not affect the correctness, so remove it.
see https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/53489/fast_test_tiprow/1793524686622035968

    syncer_nokit_test.go:192: 
        	Error Trace:	pkg/ddl/syncer/syncer_nokit_test.go:192
        	Error:      	Should be zero, but was 1
        	Test:       	TestSyncJobSchemaVerLoop

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 @D3Hunter. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-23 07:03:46.70581632 +0000 UTC m=+2327980.462951885: ☑️ agreed by lance6716.
• 2024-05-23 07:11:52.975557088 +0000 UTC m=+2328466.732692662: ☑️ agreed by hawkingrei.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 74.5038%. Comparing base (22dc064) to head (8e9b526).

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #53507        +/-   ##
================================================
+ Coverage   74.4026%   74.5038%   +0.1012%     
================================================
  Files          1505       1505                
  Lines        357263     430473     +73210     
================================================
+ Hits         265813     320719     +54906     
- Misses        72137      89845     +17708     
- Partials      19313      19909       +596     

Flag	Coverage Δ
integration	49.1313% <0.0000%> (?)
unit	71.3299% <0.0000%> (-1.9427%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (-2.3014%)	⬇️
parser	∅ <ø> (∅)
br	50.3892% <ø> (+7.3076%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• pkg/ddl/OWNERS [tangenta]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment