Remove remote users from the license counting and explicitly dissallow them to log in (#22582)

* Making all the counts aware of Remote users

* Disable login for remote users

* Adding tests for login remote_users error

* Adding tests for the store

* Adding frontend part of not counting remote users in the license

* Addressing PR review comment

* Adding the new ExternaUserId field to users

* Running make migrations-extract

* Running make app-layers and make gen-serialized

* Revert "Adding the new ExternaUserId field to users"

This reverts commit 12e5fd518962a16cdbdb8964179b6cd8e915f230.

* Adding GetUserByRemoteID methods

* Adding needed migration for users

* i18n-extract

* Fixing postgres increase remote user id field size migration up and down

* run make gen-serialized

* Removing migration code

* Not count remote users as part of the cloud pricing

* Add the cloud subscription when a user gets promote from remote to not-remote

* Fixing merge problems

---------

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

server/channels/app/plugin_api.go

@@ -257,6 +257,10 @@ func (api *PluginAPI) GetUserByUsername(name string) (*model.User, *model.AppErr
 	return api.app.GetUserByUsername(name)
 }
 
+func (api *PluginAPI) GetUserByRemoteID(remoteID string) (*model.User, *model.AppError) {
+	return api.app.GetUserByRemoteID(remoteID)
+}
+
 func (api *PluginAPI) GetUsersByUsernames(usernames []string) ([]*model.User, *model.AppError) {
 	return api.app.GetUsersByUsernames(usernames, true, nil)
 }