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/interceptors/api-version.interceptor.ts

@@ -19,7 +19,7 @@ export class ApiVersionInterceptor implements HttpInterceptor {
           'Accept': `application/json; version=${environment.apiVersion}`
         }
       })
- 
+
     return next.handle(request);
   }
 }