s3: increase defaultBufferChanSize (#1469)

[ti-srebot]

cherry-pick #1469 to release-5.0
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# In ticdc repo:
git pr https://github.com/pingcap/ticdc/pull/1632

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/ticdc.git pr/1632:release-5.0-462870d2b767

---

fix bug issue #1259 reported temporarily

What problem does this PR solve?

fix bug issue #1259 reported temporarily

What is changed and how it works?

increase the defaultBufferChanSize of s3, avoiding the l.units[hash].dataChan() full, and blocking the processor.output output rows.
https://github.com/pingcap/ticdc/blob/04e028419387871b80ddc95377751092f03f26ae/cdc/sink/cdclog/utils.go#L164-L170

Check List

Tests

• No code

Code changes

• Has persistent data change

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

• s3 sink: increase the defaultBufferChanSize of logSink to avoid blocking

[ti-srebot]

/run-all-tests

[lance6716]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• amyangfei
• lance6716

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[amyangfei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 72523a5

[codecov-io]

Codecov Report

Merging #1632 (72523a5) into release-5.0 (39c1bd9) will increase coverage by 0.0249%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##           release-5.0      #1632        +/-   ##
===================================================
+ Coverage      52.6771%   52.7020%   +0.0249%     
===================================================
  Files              152        152                
  Lines            16062      16062                
===================================================
+ Hits              8461       8465         +4     
+ Misses            6700       6696         -4     
  Partials           901        901                

[ti-chi-bot]

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