CI: add PR change detection

[Andersson007]

SUMMARY

CI: add PR change detection

Relates to:

• Allow to use ansible-test's change detection for Pull Requests ansible-community/ansible-test-gh-action#49
• https://github.com/ansible-community/ansible-test-gh-action#pull-request-change-detection

[codecov]

Codecov Report

Merging #473 (10ba4cc) into main (015f58e) will decrease coverage by 47.38%.
The diff coverage is n/a.

❗ Current head 10ba4cc differs from pull request most recent head f054997. Consider uploading reports for the commit f054997 to get more accurate results

@@             Coverage Diff             @@
##             main     #473       +/-   ##
===========================================
- Coverage   73.11%   25.72%   -47.39%     
===========================================
  Files          28       28               
  Lines        2332     2332               
  Branches      548      548               
===========================================
- Hits         1705      600     -1105     
- Misses        449     1694     +1245     
+ Partials      178       38      -140     

Flag	Coverage Δ
integration	?
sanity	15.32% <ø> (ø)
units	33.55% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
plugins/modules/mysql_query.py	18.27% <0.00%> (-70.97%)	⬇️
plugins/modules/mysql_user.py	15.38% <0.00%> (-68.27%)	⬇️
plugins/modules/mysql_db.py	8.38% <0.00%> (-67.79%)	⬇️
plugins/module_utils/user.py	14.74% <0.00%> (-62.18%)	⬇️
plugins/modules/mysql_replication.py	10.00% <0.00%> (-50.77%)	⬇️
plugins/modules/mysql_variables.py	19.49% <0.00%> (-48.31%)	⬇️
plugins/modules/mysql_role.py	31.49% <0.00%> (-48.06%)	⬇️
plugins/modules/mysql_info.py	36.18% <0.00%> (-43.22%)	⬇️
plugins/module_utils/mysql.py	30.12% <0.00%> (-40.97%)	⬇️
...ugins/module_utils/implementations/mariadb/role.py	66.66% <0.00%> (-33.34%)	⬇️
... and 2 more

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[Andersson007]

let's see #474

[patchback]

Backport to stable-2: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-2/eade7ec1f0aad6de6a6a94e5acb5e9b213c54c2b/pr-473

Backported as #476

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to stable-1: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-1/eade7ec1f0aad6de6a6a94e5acb5e9b213c54c2b/pr-473

Backported as #477

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.