Mm 64299 disable guest invite in abac channels (#31139)

* MM-64299 - disable guest invite in abac channels

* filter the abac channel list for guest

* add filter in the back-end too

* add proper translation

* simplify the condition for enforced channels and add the unit tests

* enhance validation for not inviting guest users when abac enforced channel

* add missing translation

* add value to empty translation

* prevent showing the channel name if abac protected

server/channels/app/team.go

@@ -1499,7 +1499,13 @@ func (a *App) prepareInviteGuestsToChannels(teamID string, guestsInvite *model.G
 		if channel.TeamId != teamID {
 			return nil, nil, nil, model.NewAppError("prepareInviteGuestsToChannels", "api.team.invite_guests.channel_in_invalid_team.app_error", nil, "", http.StatusBadRequest)
 		}
+
+		// Check if the channel has access control policy enforcement
+		if channel.PolicyEnforced {
+			return nil, nil, nil, model.NewAppError("prepareInviteGuestsToChannels", "api.team.invite_guests.policy_enforced_channel.app_error", nil, "", http.StatusBadRequest)
+		}
 	}
+
 	return user, team, channels, nil
 }