Fix bulk delete error by making delById more defensive

- Extract map reference to local variable before iteration
- Change from forEach to for-of loop for better error handling
- Add null check on map before iterating
- Add @popperjs/core peer dependency for ng-bootstrap
- Update .gitignore to exclude package-lock.json

Co-authored-by: alexta69 <7450369+alexta69@users.noreply.github.com>

.gitignore

@@ -7,6 +7,7 @@
 
 # dependencies
 /ui/node_modules
+/ui/package-lock.json
 
 # profiling files
 chrome-profiler-events*.json