refs #19217 - extract template combination "Remove" string

Fixes #19217 - update the close icon to remove icon

In "Add Parameters" and "Add Combinations", we noticed
there are "Remove" icons, but currently using the Close
icon, based on the icon guideline, we suggest to use the
right icon for correct meaning.

fixes #16288 - moves ace editor to webpack.

I've tried to limit changes to minimum, besides fixing lint errors i've:
- moved to brace package (as its compatable with br and webpack).
- added ERB as a syntex highlight.

Fixes #17872 - Update button label from New to Create

Based on PatternFly Terminology and Wording suggestions
Don't recommend to use New, so update New to Create.

Fixes #18085 - Update 'Build PXE Default' to secondary style

Each page should have one clear call to action, so update the
Build-PXE-Default button to secondary button style

Fixes #16167 - added list of safemode methods

Fixes #16264 - Template combinations cannot be created

Currently, strong parameters is not allowing passing the nested
attributes required to ProvisioningTemplate to create
TemplateCombinations through the UI.
The fix is as simple as permitting those parameters in a 'nested'...

Fixes #12945 - use helper for table css classes

Fixes #14395 - Label for provision template capitalized in os details page

s

Fixes #12979 - Create helper for "new" button

Previously the button classes were applied to new buttons using jQuery.
This commit creates a `new_link` helper that makes sure all new buttons
will receive the correct class and only display if authorized. Also a...