Add Drupal 11 support

At least eslint issues are not fixed yet. Perhaps tests fail too on Drupal 11.

Alright! All checks pass, tests pass on Drupal 11.

I'm leaving this issue open for a few weeks so others have a chance to review the changes.

I some of the mark the remaining tasks as "DONE".

Retested and checked my code again. All looks good. Merged.

JS tests are failing on Drupal 11 with the following error:

Cannot call non W3C standard command while in W3C mode

This error is triggered by the following code:
$this->getSession()->getDriver()->getWebDriverSession()->element('xpath', $xpath)->location();

Apparently, the method location() is not a standard W3C command.

It does look like the method rect() can also return an element's location, according to https://github.com/jlipps/simple-wd-spec?tab=readme-ov-file#get-element-..., so let's try that.

Okay, using rect() fixed the JS test failures! Merged.

Automatically closed - issue fixed for 2 weeks with no activity.