chore(CI): only trigger integration-tests when merging into main

[al3mart]

Only trigger integration-test execution either when changes are meant to be merged into main branch or when triggered manually via workflow dispatch.

[AlexD10S]

LGTM!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.94%. Comparing base (938c784) to head (61b4357).

@@            Coverage Diff             @@
##             main     #894      +/-   ##
==========================================
+ Coverage   70.72%   72.94%   +2.21%     
==========================================
  Files         117      117              
  Lines       28117    28117              
  Branches    28117    28117              
==========================================
+ Hits        19886    20510     +624     
+ Misses       6115     5457     -658     
- Partials     2116     2150      +34     

see 40 files with indirect coverage changes

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[moliholy]

@al3mart integration tests have been fixed now. I propose not to merge this PR.