Drupal 11 compatibility fixes

MR made.

Many phpstan and phpcs issues still present in the module.

@todo Move the following into their own issues and do not merge them as part of this issue:

• GitlabCI setup
• phpstan/cs fixes

Updated MR to branch off 8.x-1.x once these are merged:

• 📌 Automated Drupal 10 compatibility fixes RTBC
• 📌 Enable GitlabCI for Views Advanced Cache Active
• 📌 Fix CS/SA/eslint/cspell issues Needs work
• 🐛 Add config schema for Views Advanced Cache Active

Failure on Drupal 11 testing caused by removal of "spaceless" in twig, resulting in extra whitespace characters being expected in the output.
📌 Remove use of deprecated "spaceless" filter in core templates Active

Wrap expected text in version_compare to handle testing in both branches. May need to be fixed if Twig is updated for Drupal 10.5.x branch.

elc → changed the visibility of the branch 2.x to hidden.

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