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/common/date-dropdown/date-dropdown.component.html

@@ -55,7 +55,7 @@
               </button>
             </div>
           </div>
-          
+
         </div>
     </div>
   </div>