feat(github-actions): run tests first

The tests are the most valuable part of the CI pipeline, so these should
be run first.

If a PHPCS or PHPStan error occurs but the tests pass, we know the
functionality works and the error can be addressed.

If a test fails, the CI pipeline will fail sooner.

In the future, the tasks could be split into separate jobs though it
would need to be done in a way that doesn't add a lot of repetition.

Refs: OD-41

templates/ci/github-actions/ci.yml.twig

@@ -40,6 +40,8 @@ jobs:
 
           just composer install --quiet --no-progress
 
+          just test --testdox --colors=always
+
           {% if "phpcs" in php|keys -%}
           just _run php phpcs
           {%- endif %}
@@ -47,5 +49,3 @@ jobs:
           {% if "phpstan" in php|keys -%}
           just _run php phpstan analyze --no-progress --memory-limit=512M
           {%- endif %}
-
-          just test --testdox --colors=always