[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/storetest/store.go

@@ -61,6 +61,7 @@ type Store struct {
 	PostAcknowledgementStore        mocks.PostAcknowledgementStore
 	PostPersistentNotificationStore mocks.PostPersistentNotificationStore
 	TrueUpReviewStore               mocks.TrueUpReviewStore
+	DesktopTokensStore              mocks.DesktopTokensStore
 }
 
 func (s *Store) SetContext(context context.Context)                { s.context = context }
@@ -103,6 +104,7 @@ func (s *Store) ChannelMemberHistory() store.ChannelMemberHistoryStore {
 	return &s.ChannelMemberHistoryStore
 }
 func (s *Store) TrueUpReview() store.TrueUpReviewStore   { return &s.TrueUpReviewStore }
+func (s *Store) DesktopTokens() store.DesktopTokensStore { return &s.DesktopTokensStore }
 func (s *Store) NotifyAdmin() store.NotifyAdminStore     { return &s.NotifyAdminStore }
 func (s *Store) Group() store.GroupStore                 { return &s.GroupStore }
 func (s *Store) LinkMetadata() store.LinkMetadataStore   { return &s.LinkMetadataStore }
@@ -177,5 +179,6 @@ func (s *Store) AssertExpectations(t mock.TestingT) bool {
 		&s.PostPriorityStore,
 		&s.PostAcknowledgementStore,
 		&s.PostPersistentNotificationStore,
+		&s.DesktopTokensStore,
 	)
 }