Provides:
- A Group plugin for Alert banners.
- A View for listing Alert banners belonging to groups.
- User permissions to go along with the localgov_microsites_group module.

- Fixed Alert banner's entity *type* name during config dependency calculation.
- Added group relation type cached clear during Alert banner bundle creation.
  This is needed for config import to work.

Automated test for banner allocation to a test group bundle.

The suggested dependencies (e.g. group) from composer.json are required to run
some of the tests.

Fix for composer command in test runner to grab suggested packages.

When a new banner is set to go live, we should end up in the "Put banner live"
tab of the new banner after the banner form is submitted.  At the moment we are
ending up in the banner's "View" tab.

Also, group banners should only appear in group pages and not all over the site.

Decide the active group either based on the current path or the current domain.
This is useful where we are using the domain_group module to associate a domain
with a group.

Once a group banner is published, redirect to the group banner listing page
instead of to the site-wide banner listing page.

Optional Alert banner block configuration for the localgov_microsites_base
theme.  Automates setup of the Alert banner block for LocalGov Drupal Microsites
distribution users.