refactor(i18n): use common messages for generic button labels (#7020)

A few components defined their own "Cancel", "Close", "Clear" and
"Success" descriptors when commonMessages already has them. Swapped
them over and removed the old ones.

Locale files come from intl:prune-local dropping the now-orphaned
strings across every language.

packages/ui/src/locales/sr-CS/index.json

@@ -1253,9 +1253,6 @@
   "files.editor.file-saved-title": {
     "defaultMessage": "Datoteka sačuvana"
   },
-  "files.editor.find-close": {
-    "defaultMessage": "Zatvori"
-  },
   "files.editor.find-in-file": {
     "defaultMessage": "Pronađi"
   },
@@ -5784,4 +5781,3 @@
     "defaultMessage": "Tip"
   }
 }
-