Refine mysql hints on server startup

[TennyZhuang]

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Summary

Summary about this PR

Changelog

• Improvement
• Not for changelog (changelog entry is not required)

Related Issues

Fixes #issue

Test Plan

Unit Tests

Stateless Tests

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[PsiACE]

LGTM, thanks

[codecov-commenter]

Codecov Report

Merging #3921 (a73f927) into main (9c99b0a) will decrease coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #3921   +/-   ##
=====================================
- Coverage     56%     56%   -1%     
=====================================
  Files        800     800           
  Lines      42754   42754           
=====================================
- Hits       24348   24343    -5     
- Misses     18406   18411    +5     

Impacted Files	Coverage Δ
common/dal/src/context.rs	81% <0%> (-3%)	⬇️
common/management/src/cluster/cluster_mgr.rs	78% <0%> (-2%)	⬇️
common/meta/sled-store/src/sled_tree.rs	86% <0%> (-2%)	⬇️
common/containers/src/pool.rs	85% <0%> (+6%)	⬆️

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[bohutang]

@TennyZhuang Thank you!