sink(ticdc): limit encoder-concurrency to avoid crash (#11775)

[ti-chi-bot]

This is an automated cherry-pick of #11775

What problem does this PR solve?

Issue Number: close #11773

What is changed and how it works?

As title. The maximum value is CPU count * 10

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`.

[wk989898]

/retest

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[wk989898]

/retest

[wk989898]

/retest

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: wk989898
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[wk989898]

/retest

[wk989898]

/retest

[wk989898]

/retest

[wk989898]

/retest

[ti-chi-bot]

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

Test name	Commit	Details	Required	Rerun command
pull-cdc-integration-mysql-test	3badb1f	link	true	/test cdc-integration-mysql-test

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