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/user.go

@@ -308,7 +308,7 @@ func (a *App) createUserOrGuest(c request.CTX, user *model.User, guest bool) (*m
 	// table in CWS. This is then used to calculate how much the customers have to pay in addition for the extra users. If the
 	// workspace is currently on a monthly plan, then this function will not do anything.
 
-	if a.Channels().License().IsCloud() {
+	if a.Channels().License().IsCloud() && !ruser.IsRemote() {
 		go func(userId string) {
 			_, err := a.SendSubscriptionHistoryEvent(userId)
 			if err != nil {
@@ -440,6 +440,20 @@ func (a *App) GetUserByEmail(email string) (*model.User, *model.AppError) {
 	return user, nil
 }
 
+func (a *App) GetUserByRemoteID(remoteID string) (*model.User, *model.AppError) {
+	user, err := a.ch.srv.userService.GetUserByRemoteID(remoteID)
+	if err != nil {
+		var nfErr *store.ErrNotFound
+		switch {
+		case errors.As(err, &nfErr):
+			return nil, model.NewAppError("GetUserByRemoteID", MissingAccountError, nil, "", http.StatusNotFound).Wrap(err)
+		default:
+			return nil, model.NewAppError("GetUserByRemoteID", MissingAccountError, nil, "", http.StatusInternalServerError).Wrap(err)
+		}
+	}
+	return user, nil
+}
+
 func (a *App) GetUserByAuth(authData *string, authService string) (*model.User, *model.AppError) {
 	user, err := a.ch.srv.userService.GetUserByAuth(authData, authService)
 	if err != nil {
@@ -1262,6 +1276,15 @@ func (a *App) UpdateUser(c request.CTX, user *model.User, sendNotifications bool
 	a.InvalidateCacheForUser(user.Id)
 	a.onUserProfileChange(user.Id)
 
+	if a.Channels().License().IsCloud() && prev.IsRemote() && !user.IsRemote() {
+		go func(userId string) {
+			_, err := a.SendSubscriptionHistoryEvent(userId)
+			if err != nil {
+				c.Logger().Error("Failed to create/update the SubscriptionHistoryEvent", mlog.Err(err))
+			}
+		}(user.Id)
+	}
+
 	return newUser, nil
 }