[MM-37984] Allow Desktop App to authenticate via external providers outside of the app on supported servers (#23795)

* WIP

* Add rate limiting for desktop token API

* Missing mocks

* Style fixes

* Update snapshots

* Maybe use an actual redirect link :P

* Refactoring for tests

* Add tests for server

* Fix lint issue

* Fix tests

* Fix lint

* Add front-end screen component

* Component logic

* Style changes

* Quick style fix

* Lint fixes

* Initial PR feedback

* Enable logging into the browser as well when completing the login process

* Refactor to push more logic to the other component

* Remove unnecessary helper code

* Fix i18n

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/store.go

@@ -86,6 +86,7 @@ type Store interface {
 	PostAcknowledgement() PostAcknowledgementStore
 	PostPersistentNotification() PostPersistentNotificationStore
 	TrueUpReview() TrueUpReviewStore
+	DesktopTokens() DesktopTokensStore
 }
 
 type RetentionPolicyStore interface {
@@ -665,6 +666,15 @@ type TokenStore interface {
 	RemoveAllTokensByType(tokenType string) error
 }
 
+type DesktopTokensStore interface {
+	GetUserId(desktopToken string, minCreatedAt int64) (string, error)
+	Insert(desktopToken string, createdAt int64, userId *string) error
+	SetUserId(desktopToken string, minCreatedAt int64, userId string) error
+	Delete(desktopToken string) error
+	DeleteByUserId(userId string) error
+	DeleteOlderThan(minCreatedAt int64) error
+}
+
 type EmojiStore interface {
 	Save(emoji *model.Emoji) (*model.Emoji, error)
 	Get(ctx context.Context, id string, allowFromCache bool) (*model.Emoji, error)