Issue #3032327: As a LU the tags block should be updated after I add a tag to a group/node

Issue #3027339: The 'pill badge' style is not working properly in text editors

Issue #3026071: As a GM I want to get a notification when someone new joined my group

Issue #3027510 by truls1502: Update drupal/bootstrap from 3.15.0 to 3.17.0

Issue #3027339 by chmez: Use other CSS classes for "Pill badge" CKEditor style for fix showing text with this style as invisible.

Issue #2968506 by uros.ceh, jaapjan, truls1502: When group is deleted the posts in this group should be deleted as well (#1188)

* Issue #2968506 by uros.ceh, jaapjan, truls1502: When group is deleted the posts in this group should be deleted as well

* Add "This action cannot be undone."

* Change link type to button.

* Issue #3031860 by truls1502: Update drupal/admin_toolbar from 1.25 to 1.26

* Issue #3031860 by truls1502: Update drupal/admin_toolbar from 1.25 to 1.26 on make-file

Update drupal core in make file to 8.6.9. (4.x branch)

Issue #3029276 by chmez: Make a method for batch finish callback as static and replace deprecated functionality for showing system messages. (#1204)

Issue #2977782 by chmez: Show thread as read when it contains few messages and the last message is own. (#1185)

Issue #3010782 by malaynayak, Kingdutch, jaapjan: Ensure search menu local tasks have proper weights (#1189)

Merge pull request #1200 from goalgorilla/feature/3028367 

Merge pull request #1202 from goalgorilla/feature/3028992 

We don't use coffeescript files in Open Social. The original libraries
are also not findable anywhere. At this point the compiled source has
been changed to fix a bug. We remove the library to ensure that the bug
isn't accidentally re-introduced by a trigger-happy developer in the
future.

The work done for the social_embed configuration override is pretty
important to happen together. It makes sense to just move this work into
a single class with separate methods that are easy to parse. This
reduces the cognitive overhead of having a base class and further
indirection.