cluster: unify default tiflash logger size/count with doc

[fzzf678]

What problem does this PR solve?

In the doc https://docs.pingcap.com/tidb/stable/tiflash-configuration/#logger, the logger.size and logger.count should be 100M and 10, this is not consistent with the default value in the tiup cluster.

close #2684

What is changed and how it works?

Unify the logger size and count with doc

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

Remove hardcoded TiFlash logger.size/logger.count from TiUP Cluster’s generated config so TiFlash uses its built-in default log rotation settings.

[ti-chi-bot]

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[pingcap-cla-assistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.35%. Comparing base (c567110) to head (d7eb757).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2683      +/-   ##
==========================================
- Coverage   42.37%   42.35%   -0.02%     
==========================================
  Files         424      424              
  Lines       47043    47041       -2     
==========================================
- Hits        19932    19920      -12     
- Misses      24425    24433       +8     
- Partials     2686     2688       +2     

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[JaySon-Huang]

We'd better directly remove these two config from tiup and let tiflash use its default value in the tiflash code.

[fzzf678]

Update in d7eb757

[JaySon-Huang]

LGTM

And we should update this behavior in the "Release note" of tiup new version

[ti-chi-bot]

@JaySon-Huang: adding LGTM is restricted to approvers and reviewers in OWNERS files.

Details

In response to this:

LGTM

And we should update this behavior in the "Release note" of tiup new version

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[fzzf678]

/retest