* [NIFI-13093] use warn palette for all errors and introduce caution palette
* update semantic color names
* update warn palette darker hue
* import ErrorBanner component into cluster.component.spec.ts
* .primary-contrast
* some code clean up and reuse of .surface-contrast
* caution color cleanup
* update bulletin to use inverted contrast color and semantic caution-color class
This closes#8721
9ac17833b8