[MM-37984] Allow Desktop App to authenticate via external providers outside of the app on supported servers (#24140)

* [MM-37984] Allow Desktop App to authenticate via external providers outside of the app on supported servers

* PR feedback

* Add support for mattermost-dev protocol for development use

* Update server/channels/db/migrations/postgres/000110_create_desktop_tokens.up.sql

* Fix silly typo

* Update server/channels/db/migrations/postgres/000110_create_desktop_tokens.up.sql

* Remove storage of client token, only validate it on the client

* Update migrations

* Add concurrently create index

* Remove CONCURRENTLY for now

* Fix issue with changing history

* Remove old migration

* Use idempotent statement to drop old index

* Remove reference to old table

server/i18n/en.json

@@ -5079,6 +5079,18 @@
     "id": "app.custom_group.unique_name",
     "translation": "group name is not unique"
   },
+  {
+    "id": "app.desktop_token.generateServerToken.invalid_or_expired",
+    "translation": "Token does not exist or is expired"
+  },
+  {
+    "id": "app.desktop_token.validate.invalid",
+    "translation": "Token is not valid or is expired"
+  },
+  {
+    "id": "app.desktop_token.validate.no_user",
+    "translation": "Cannot find a user for this token"
+  },
   {
     "id": "app.draft.delete.app_error",
     "translation": "Unable to delete the Draft."