Fix coding standards.

[finnlewis]

Not quite there yet, but creating merge request for peer review.

[finnlewis]

Notes from Merge Tuesday:

• @stephen-cox suggested following the steps in the Drupal Container to run the tests.
• Note: need to shell into the docker container and turn on the html output:
• See https://github.com/localgovdrupal/drupal-container/blob/php8.1/run-tests.sh#L32C1-L33C1

[ekes]

Going to close this in favour of the combined #455