Fixes #13047, #16291 - Upgrade datatables and move it to npm

Fixes #16164 - False positives on testing CR connection

Prevents from showing success message when there's a validation
error in the returned form and adds error handling for
the test connection ajax call.

Fixes #16357 - Losslessly optimized assets

Ran some lossless optimisation on foreman’s images

Fixes #16379 - Improve layout of hostname randomize button

This moves the button from being a line of its own to a button in the
input.
Also changed the form helper to streamline adding button to inputs and
got rid of a useless helper.

Fixes #16163 - Hide spinner for vmware cluster

Fixes #7806 - allow taxonomy association on role level

i18n - extracting new, pulling from tx

Fixes #12634 - New HW Model flag pxe_loader

Implementation of

https://github.com/theforeman/rfcs/blob/master/text/0001-PXE-Booting-UEFI.md

In short, new host/hostgroup flag PXE loader is added to specify TFTP
DHCP filename and Foreman now orchestrates all PXE-capable templates...

i18n - extracting new, pulling from tx

Fixes #16120 - Allow including css in webpack assets

This commit demonstrates using the css from the select2 module using the
webpack css loaders. Images under 32k will be compiled into the css to
reduce request counts.