Previously, this was all just a background-color and background-image. When we restored the gradients though, we had two background-images competing on the same element, causing rendering glitches. This refactors that code, creating a mixin to simplify things, so we can we easily use two background-images (SVG icon and gradient) when $enable-gradients is set to true.
Fixes #24598 (closed).
Todo
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Remove variable changes -
Double check validation states of custom checks