js_cookie module not enabled when updating from CAS 2.x to 3.x

Problem/Motivation

When updating from CAS 2.x to 3.x, the new js_cookie dependency is not installed. If installing CAS 3.x from the start, js_cookie is installed as expected. I noticed when installing a new site from an install profile that it was failing because js_cookie was not in core.extension.yml.

Steps to reproduce

1. Install a new Drupal 10 site
2. composer require 'drupal/cas:^2.3'
3. drush en cas -y
4. composer require 'drupal/cas:^3.0@beta'
5. drush updb -y
6. Verify that js_cookie is not enabled

Proposed resolution

Add a post_update hook that installs js_cookie if CAS has gateway auth enabled and is configured to use the client side redirect.

Update the CAS config form to prevent users from enabling gateway auth with client side redirect if the module is not already installed (add a form validation error?)

Update our JS for client side auth to confirm that the Cookie library is available. If not, just back out and do nothing. This will prevent JS errors.

Remove JS cookie as a module dependency in the .info.yml file