Updates checklists

Author: ferreteleco

{{ cookiecutter.__github_folder }}/_/workflows/cpp/cpp-unit-test-action-checklist.md

@@ -12,3 +12,6 @@ it to the remote repository.
       (defaults to *ubuntu-22.04*, hosted by GH).
     - [ ] The credentials for acquiring the Docker image(if needed) have been configured via secrets
     and required section in action file uncommented.
+
+In GitHub's repository settings >> Branches >> Branch protection rules >> Enable 'Require status
+checks to pass before merging'.

{{ cookiecutter.__github_folder }}/_/workflows/python/python-unit-test-action-checklist.md

@@ -10,3 +10,9 @@ it to the remote repository.
 - [ ] The target test directory where tests live has been defined (defaults to *tests*).
 - [ ] The target runner(s) in which to run the CI Unit Testing workflow have been configured
       (defaults to *ubuntu-22.04*, hosted by GH).
+
+Note that, for a PR to be blocked if Unit Testing action fails, status checks must be enabled on the
+target branch.
+
+In GitHub's repository settings >> Branches >> Branch protection rules >> Enable 'Require status
+checks to pass before merging'.