[chore] trigger changelog CI check on PR title edit

[cijothomas]

The changelog CI check is modified to be re-triggered when the PR title is edited. The changelog CI relies on PR title, so I think it makes sense to rerun it when one edits PR title (eg to include "chore", that can make the CI pass)

[cijothomas]

Tested in this PR itself - editing title re-triggered the check and it is no longer red!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.50%. Comparing base (cf49766) to head (dbf2483).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12737   +/-   ##
=======================================
  Coverage   91.50%   91.50%           
=======================================
  Files         480      480           
  Lines       26464    26464           
=======================================
  Hits        24217    24217           
  Misses       1778     1778           
  Partials      469      469           

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