Adds levitate levignore configuration file to prevent breaking change notifications from expected typescript symbols (#74371)

* Adds levitate levignore configuration file to prevent breaking change notifications from expected typescript symbols

* Add root file to codeowners

* Remove unnecessary word boundary

* Exand it to changes and a\dditions too

.levignore.js

@@ -0,0 +1,5 @@
+module.exports = {
+  removals: [/FeatureToggles\..*/],
+  additions: [/FeatureToggles\..*/],
+  changes: [/FeatureToggles\..*/],
+};