SimpleUI: support target's tags edition, display installed & assigned distribution sets, and action history (#2409)

* simple-ui: fix flaky OAuth2TokenManager bean creation

* simple-ui: add Assigned / installed tab

This is inspired by the original hawkbit interface; however, as we've got more space it merges both Assigned and Installed into the same tab

* simple-ui: add assign and unassign to targets, and create tags

* simple-ui: add action history tab

This allows tracking the actions, see their status, and cancel / force / force cancel them; just like the previous ui

This has some limitations though; the previous UI had access to the Action's main class, whereas we're dealing with the rest dto; hence we're missing some information to make the ui simpler to create.

* use textblock with generic line-separator

* fix tags not shown due to missing badge import

* improve the action's status by combining the four statuses into one icon

hawkbit-simple-ui/.gitignore

@@ -1,5 +1,6 @@
 bundles
-frontend
+src/main/frontend/*
+!src/main/frontend/themes/
 node_modules
 package.json
 package-lock.json