Add status and form ui/ux improvements

* Adjust popover styling
* Form label / dropdown styling

Issue: #5615
Reference: Tower UX Improvements doc

awx/ui/client/legacy-styles/forms.less

@@ -337,10 +337,6 @@
     height: 28px!important;
 }
 
-.select2-selection__arrow:hover{
-    background-color:@field-button-hov !important;
-}
-
 .select2-results__option{
     color: @field-label !important;
     height: 30px!important;