changelogs: squash 19.0.2/19.0.3 into just 19.0.3 and remove 19.0.2

[systay]

Description

Since we don't want people to use 19.0.2, we edit the changelogs to make it seem like all changes in 19.0.2 and 19.0.3 happened in 19.03

Related Issue(s)

#15656
#15572

[vitess-bot]

Review Checklist

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• Ensure that the Pull Request has a descriptive title.
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Tests

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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.13%. Comparing base (696fe0e) to head (5428e49).
Report is 195 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15665      +/-   ##
==========================================
+ Coverage   67.41%   68.13%   +0.71%     
==========================================
  Files        1560     1556       -4     
  Lines      192752   195028    +2276     
==========================================
+ Hits       129952   132885    +2933     
+ Misses      62800    62143     -657     

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