Export convertMySQLVersionToCommentVersion to use it in vitess-operator

[frouioui]

Description

Tiny refactor to export convertMySQLVersionToCommentVersion so that it can be used in vitess-operator to validate the MySQL version in order to set the --mysql_server_version properly to each Vitess component.

[vitess-bot]

Review Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6f48aba) 47.30% compared to head (c7c7dde) 47.31%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14988      +/-   ##
==========================================
+ Coverage   47.30%   47.31%   +0.01%     
==========================================
  Files        1141     1142       +1     
  Lines      238965   239009      +44     
==========================================
+ Hits       113040   113097      +57     
+ Misses     117325   117317       -8     
+ Partials     8600     8595       -5     

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