MM-39058 - invite people to join team and channels (#19849)

* MM-39058-invite-to-team-from-add-channel

* fix tests by validating the memberInvite is not nil

* fix i18n texts

* fix lint problem

* fix translation lines

* fix the data structure

* modify api4-team_local file to match with the expected structure

* fix unit tests, fix translation tests

* remove go routine cause not necesary

* add unit test for invite to team and channel

* remove unnecessary validation

* allow both data structures, simple string array and object with memberInvite struct

* fix texts

* fix linter

* fix problems with graceful invites workflow

* handle error while parsing body

* fix unit tests

* take the address just once

* rename channels to channelIds

* fix unit tests

* add tests and fix local channels invite support

Co-authored-by: Pablo Velez Vidal <pablo.velez@mattermost.com>

app/user.go

@@ -99,7 +99,7 @@ func (a *App) CreateUserWithToken(c *request.Context, user *model.User, token *m
 
 	a.AddDirectChannels(team.Id, ruser)
 
-	if token.Type == TokenTypeGuestInvitation {
+	if token.Type == TokenTypeGuestInvitation || (token.Type == TokenTypeTeamInvitation && len(channels) > 0) {
 		for _, channel := range channels {
 			_, err := a.AddChannelMember(c, ruser.Id, channel, ChannelMemberOpts{})
 			if err != nil {