kubernetes: Escape CSS newline correctly
kubernetes: Escape CSS newline correctly

Due to the combination of webpack and less this newline
escape sequence was being prematurely unescaped during
builds. This resulted in a literal 'A' character on the screen.

Closes #4847
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

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