Fixes #18740 - remove erb extension from host_checkbox.js

Fixes #18364 - disable hide of dropdown + tooltip

fixes #18248 - dashboard auto refresh mounts duplicate components

fixes #18250 - show compute resource xhr errors

fixes #18010 - UI Notifications front-end implementation

Fixes #17844 - unify test mail js code

Fixes #18099 - Update the close button style

Change the close button style in the modal window, keep consistent
with PatternFly close button.

Fixes #14714 - Make inherited Puppet Classes more apparent

To better recognize which Puppet Classes are inherited for Host
or Hostgroup they are under a sub-heading as a seperated list.

Fixes #17971 - move user taxonomyAdded js to webpack

Fixes #3551 - Show unavailable Puppet Classes in Host Group edit

Puppet Classes can be assigned to a Host Group even if they are
not available in the set environment.

The Classes persist through out changes of the environment,
but were previously hidden from the UI this changes that....