[PR #473/eade7ec1 backport][stable-2] CI: add PR change detection

[patchback]

This is a backport of PR #473 as merged into main (eade7ec).

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 #476 (6b0e392) into stable-2 (2b6adcd) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           stable-2     #476   +/-   ##
=========================================
  Coverage     73.03%   73.03%           
=========================================
  Files            28       28           
  Lines          2310     2310           
  Branches        541      541           
=========================================
  Hits           1687     1687           
  Misses          446      446           
  Partials        177      177           

Flag	Coverage Δ
integration	69.60% <ø> (ø)
sanity	15.58% <ø> (ø)
units	35.29% <ø> (ø)

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