Migrating the admin_definition.jsx file to typescript (#24658)

* Migrating admin_definition from jsx to tsx

* Fixing types and errors

* Fixing all the types errors

* Fixing linter errors

* Removing no longer needed yup dependency

* Moving admin_definition types to its own file

* Removing a couple of anys

* Fixing linter errors

* Fixing tests snapshots

webapp/channels/package.json

@@ -178,8 +178,7 @@
     "stylelint-scss": "3.19.0",
     "webpack-bundle-analyzer": "4.7.0",
     "webpack-pwa-manifest": "4.3.0",
-    "yargs": "16.2.0",
-    "yup": "0.32.11"
+    "yargs": "16.2.0"
   },
   "scripts": {
     "check": "eslint --ext .js,.jsx,.tsx,.ts ./src --quiet --cache && stylelint \"**/*.{css,scss}\" --cache",