sink(ticdc): limit encoder-concurrency to avoid OOM

[wk989898]

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]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 55.1680%. Comparing base (ea35677) to head (5961029).

Additional details and impacted files

Components	Coverage Δ
cdc	59.6172% <0.0000%> (+0.0328%)	⬆️
dm	50.0384% <ø> (+0.0019%)	⬆️
engine	53.2054% <ø> (-0.0339%)	⬇️

Flag	Coverage Δ
unit	55.1680% <0.0000%> (+0.0126%)	⬆️

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

@@               Coverage Diff                @@
##             master     #11775        +/-   ##
================================================
+ Coverage   55.1554%   55.1680%   +0.0126%     
================================================
  Files          1002       1002                
  Lines        137399     137402         +3     
================================================
+ Hits          75783      75802        +19     
+ Misses        56073      56059        -14     
+ Partials       5543       5541         -2     

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[ti-chi-bot]

@wk989898: 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-dm-integration-test	5961029	link	true	/test dm-integration-test

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