Normalize whitespace in source files

Ensure that no source files have trailing whitespace at end of lines and ensure that all files end with a single trailing newline.

This also adds Github Actions to enforce whitespace conventions.

src-ui/src/app/components/dashboard/widgets/widget-frame/widget-frame.component.html

@@ -4,9 +4,9 @@
       <h5 class="card-title mb-0">{{title}}</h5>
       <ng-content select ="[header-buttons]"></ng-content>
     </div>
-    
+
   </div>
   <div class="card-body text-dark">
     <ng-content select ="[content]"></ng-content>
   </div>
-</div>
+</div>