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/select-dialog/select-dialog.component.html

@@ -12,4 +12,4 @@
 <div class="modal-footer">
   <button type="button" class="btn btn-outline-dark" (click)="cancelClicked()" i18n>Cancel</button>
   <button type="button" class="btn btn-primary" (click)="selectClicked.emit(selected)" i18n>Select</button>
-</div>
+</div>