*: init ctx for extractWorker (#55228)

[ti-chi-bot]

This is an automated cherry-pick of #55228

What problem does this PR solve?

Issue Number: close #55217

Problem Summary:

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.

None

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, lance6716

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-24 09:12:57.431485736 +0000 UTC m=+1557247.171909685: ☑️ agreed by Benjamin2037.
• 2024-09-24 10:03:30.223966599 +0000 UTC m=+1560279.964390537: ☑️ agreed by lance6716.

[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	52c580c	link	true	/test build
idc-jenkins-ci-tidb/check_dev_2	52c580c	link	true	/test check-dev2
idc-jenkins-ci-tidb/mysql-test	52c580c	link	true	/test mysql-test
idc-jenkins-ci-tidb/check_dev	52c580c	link	true	/test check-dev
idc-jenkins-ci-tidb/unit-test	52c580c	link	true	/test unit-test

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