Move the sanitization and validation of CPA values to the model (#30653)

* Move the sanitization and validation of CPA values to the model

* Fix CI

* Use proper IDs instead of strings

---------

Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/i18n/en.json

@@ -1865,14 +1865,6 @@
     "id": "api.custom_groups.no_remote_id",
     "translation": "remote_id must be blank for custom group"
   },
-  {
-    "id": "api.custom_profile_attributes.field_conversion_error",
-    "translation": "Unable to convert the property field to a custom profile attribute field"
-  },
-  {
-    "id": "api.custom_profile_attributes.field_not_found",
-    "translation": "trying to patch a field that does not exist"
-  },
   {
     "id": "api.custom_profile_attributes.invalid_field_patch",
     "translation": "invalid custom profile attribute field patch"
@@ -5086,6 +5078,10 @@
     "id": "app.custom_profile_attributes.search_property_fields.app_error",
     "translation": "Unable to search Custom Profile Attribute fields"
   },
+  {
+    "id": "app.custom_profile_attributes.validate_value.app_error",
+    "translation": "Failed to validate property value"
+  },
   {
     "id": "app.delete_scheduled_post.delete_error",
     "translation": "Failed to delete scheduled post from database."