MM-24176: Regenerate invite ID on team privacy change. (#14529)

* MM-24176: Regenerate invite ID on team privacy change.

* Fix the other place this setting can be changed.

* Fix tests.

* Satisfy the tyrannical golangci-lint.

app/app_iface.go

@@ -376,6 +376,7 @@ type AppIface interface {
 	CheckUserMfa(user *model.User, token string) *model.AppError
 	CheckUserPostflightAuthenticationCriteria(user *model.User) *model.AppError
 	CheckUserPreflightAuthenticationCriteria(user *model.User, mfaToken string) *model.AppError
+	CheckValidDomains(team *model.Team) *model.AppError
 	ClearChannelMembersCache(channelID string)
 	ClearSessionCacheForAllUsers()
 	ClearSessionCacheForAllUsersSkipClusterSend()