Fix failing Collection CI Checks (#16157)

* Fix CI: Use Python 3.13 for ansible-test compatibility

  ansible-test only supports Python 3.11, 3.12, and 3.13.
  Changed collection-integration jobs from '3.x' to '3.13'
  to avoid using Python 3.14 which is not supported.

* Fix ansible-test Python version for CI integration tests

  ansible-test only supports Python 3.11, 3.12, and 3.13.
  Added ANSIBLE_TEST_PYTHON_VERSION variable to explicitly pass
  --python 3.13 flag to ansible-test integration command.

  This prevents ansible-test from auto-detecting and using
  Python 3.14.0, which is not supported.

* Fix CI: Execute ansible-test with Python 3.13 to avoid
  unsupported Python 3.14

* Fix CI: Use Python 3.13 across all jobs to avoid Python
  3.14 compatibility issues

* Fix CI: Use 'python' and 'ansible.test' module for Python
   3.13 compatibility

* Fix CI: Use 'python' instead of 'python3' for Python 3.13
   compatibility

* Fix CI: Ensure ansible-test uses Python 3.13 environment
  explicitly

* Fix: Remove silent failure check for ansible-core in test suite

* Fix CI: Export PYTHONPATH to make awxkit available to ansible-test

* Fix CI: Use 'python' in run_awx_devel to maintain Python
  3.13 environment

* Fix CI: Remove setup-python from awx_devel_image that was resetting Python 3.13 to 3.14

.github/actions/run_awx_devel/action.yml

@@ -36,7 +36,7 @@ runs:
 
     - name: Upgrade ansible-core
       shell: bash
-      run: python3 -m pip install --upgrade ansible-core
+      run: python -m pip install --upgrade ansible-core
 
     - name: Install system deps
       shell: bash