[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/channels/store/sqlstore/store.go

@@ -108,6 +108,7 @@ type SqlStoreStores struct {
 	postAcknowledgement        store.PostAcknowledgementStore
 	postPersistentNotification store.PostPersistentNotificationStore
 	trueUpReview               store.TrueUpReviewStore
+	desktopTokens              store.DesktopTokensStore
 }
 
 type SqlStore struct {
@@ -229,6 +230,7 @@ func New(settings model.SqlSettings, metrics einterfaces.MetricsInterface) (*Sql
 	store.stores.postAcknowledgement = newSqlPostAcknowledgementStore(store)
 	store.stores.postPersistentNotification = newSqlPostPersistentNotificationStore(store)
 	store.stores.trueUpReview = newSqlTrueUpReviewStore(store)
+	store.stores.desktopTokens = newSqlDesktopTokensStore(store, metrics)
 
 	store.stores.preference.(*SqlPreferenceStore).deleteUnusedFeatures()
 
@@ -1080,6 +1082,10 @@ func (ss *SqlStore) TrueUpReview() store.TrueUpReviewStore {
 	return ss.stores.trueUpReview
 }
 
+func (ss *SqlStore) DesktopTokens() store.DesktopTokensStore {
+	return ss.stores.desktopTokens
+}
+
 func (ss *SqlStore) DropAllTables() {
 	if ss.DriverName() == model.DatabaseDriverPostgres {
 		ss.masterX.Exec(`DO