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/statistics-widget/statistics-widget.component.ts

@@ -23,7 +23,7 @@ export class StatisticsWidgetComponent implements OnInit, OnDestroy {
   statistics: Statistics = {}
 
   subscription: Subscription
-  
+
   private getStatistics(): Observable<Statistics> {
     return this.http.get(`${environment.apiBaseUrl}statistics/`)
   }