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`.

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.1@cd90b6b). Learn more about missing BASE report.

Additional details and impacted files

Components	Coverage Δ
cdc	61.8215% <0.0000%> (?)
dm	51.0419% <0.0000%> (?)
engine	63.4020% <0.0000%> (?)

Flag	Coverage Δ
unit	57.4194% <0.0000%> (?)

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

@@               Coverage Diff                @@
##             release-8.1     #11795   +/-   ##
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  Coverage               ?   57.4194%           
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  Files                  ?        854           
  Lines                  ?     126074           
  Branches               ?          0           
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  Hits                   ?      72391           
  Misses                 ?      48282           
  Partials               ?       5401           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wk989898

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[wk989898]

/retest