WS-157: display WS version on frontend

This will display the tag that's associated with the merge. So on dev, it'll say main or the git commit SHA. On test, it'll be the end of sprint tag. And on production, it'll be whatever git tag is published for that release.

apps/web/src/app/footer/footer.component.html

@@ -20,6 +20,7 @@
         <a href="" class="btn btn-link">Diversity</a>
       </p>
       <p class="small text-muted ml-2">The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.</p>
+      <p class="small text-muted ml-2"><span>Workspaces Version: {{this.version}}</span></p>
     </div>
   </div>
 </footer>