Hide delete button for templates that are in "Installing template" state

[andrijapanicsb]

ISSUE TYPE

• Bug Report

ACS 4.18.1-snapshot

Allows to press the delete button, but then gives error to try with other templates which are not "installing", etc.

Hide the button/gray-put (whatever we do in other such cases)

[nvazquez]

Hi guys, I have created PR: #7882 can you please review?

[yadvr]

Fixed in #7882