Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/app/shared_channel_service_iface.go

@@ -0,0 +1,73 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package app
+
+// TODO: platform: remove this and use from platform package
+import (
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/platform/services/sharedchannel"
+)
+
+// SharedChannelServiceIFace is the interface to the shared channel service
+type SharedChannelServiceIFace interface {
+	Shutdown() error
+	Start() error
+	NotifyChannelChanged(channelId string)
+	NotifyUserProfileChanged(userID string)
+	SendChannelInvite(channel *model.Channel, userId string, rc *model.RemoteCluster, options ...sharedchannel.InviteOption) error
+	Active() bool
+}
+
+type MockOptionSharedChannelService func(service *mockSharedChannelService)
+
+func MockOptionSharedChannelServiceWithActive(active bool) MockOptionSharedChannelService {
+	return func(mrcs *mockSharedChannelService) {
+		mrcs.active = active
+	}
+}
+
+func NewMockSharedChannelService(service SharedChannelServiceIFace, options ...MockOptionSharedChannelService) *mockSharedChannelService {
+	mrcs := &mockSharedChannelService{service, true, []string{}, []string{}, 0}
+	for _, option := range options {
+		option(mrcs)
+	}
+	return mrcs
+}
+
+type mockSharedChannelService struct {
+	SharedChannelServiceIFace
+	active                   bool
+	channelNotifications     []string
+	userProfileNotifications []string
+	numInvitations           int
+}
+
+func (mrcs *mockSharedChannelService) NotifyChannelChanged(channelId string) {
+	mrcs.channelNotifications = append(mrcs.channelNotifications, channelId)
+}
+
+func (mrcs *mockSharedChannelService) NotifyUserProfileChanged(userId string) {
+	mrcs.userProfileNotifications = append(mrcs.userProfileNotifications, userId)
+}
+
+func (mrcs *mockSharedChannelService) Shutdown() error {
+	return nil
+}
+
+func (mrcs *mockSharedChannelService) Start() error {
+	return nil
+}
+
+func (mrcs *mockSharedChannelService) Active() bool {
+	return mrcs.active
+}
+
+func (mrcs *mockSharedChannelService) SendChannelInvite(channel *model.Channel, userId string, rc *model.RemoteCluster, options ...sharedchannel.InviteOption) error {
+	mrcs.numInvitations += 1
+	return nil
+}
+
+func (mrcs *mockSharedChannelService) NumInvitations() int {
+	return mrcs.numInvitations
+}