[WIP] [MM-55031] OAuth Outgoing Connection App integration (#25379)

* OAuthOutgoingConnection model

* added store

* make generated

* add missing license headers

* fix receiver name

* i18n

* i18n sorting

* update migrations from master

* make migrations-extract

* update retrylayer tests

* replaced sql query with id pagination

* fixed flaky tests

* missing columns

* missing columns on save/update

* typo

* improved tests

* remove enum from mysql colum

* add password credentials to store

* license changes

* OAuthOutgoingConnectionInterface

* Oauth -> OAuth

* make generated

* merge migrations

* renamed migrations

* model change suggestions

* refactor test functionsn

* migration typo

* refactor store table names

* updated sanitize test

* cleanup merge

* refactor symbol

* list endpoint

* oauthoutgoingconnection -> outgoingoauthconnection

* signature change

* i18n update

* granttype typo

* naming

* api list

* uppercase typo

* i18n

* missing license header

* fixed path in comments

* updated openapi definitions

* sanitize connections

* make generated

* test license and no feature flag

* removed t.fatal

* updated testhelper calls

* yaml schema fixes

* switched interface name

* suggested translation

* missing i18n translation

* address comments

* updated i18n

server/channels/app/app.go

@@ -103,11 +103,12 @@ func (a *App) Saml() einterfaces.SamlInterface {
 func (a *App) Cloud() einterfaces.CloudInterface {
 	return a.ch.srv.Cloud
 }
-
 func (a *App) IPFiltering() einterfaces.IPFilteringInterface {
 	return a.ch.srv.IPFiltering
 }
-
+func (a *App) OutgoingOAuthConnections() einterfaces.OutgoingOAuthConnectionInterface {
+	return a.ch.srv.OutgoingOAuthConnection
+}
 func (a *App) HTTPService() httpservice.HTTPService {
 	return a.ch.srv.httpService
 }