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/document-list/document-card-large/document-card-large.component.scss

@@ -64,4 +64,4 @@
 span ::ng-deep .match {
   color: black;
   background-color: rgb(255, 211, 66);
-}
+}