Issue #3297889 by id.conky, Project Update Bot, artem_sylchuk: Drupal 10 compatibility fixes + minor codebase improvements

Adding categories to private message blocks. Fixing issue with missing category for actions block on block layout page

forcing default block classes on module blocks, as these are not provided by core when the block is overridden with a template

Adding history API into thread inbox, to change the URL when threads are clicked in the inbox. Setting up the inbox update to be triggered after a new post is made. Adding .active-thread class to the active thread in the inbox. Removing .unread-thread class from inbox thread when a thread is viewed. Fixing cache tag invalidation overall for inbox