Shared channels auto-share DM & group messages (#26097)

* option for auto inviting plugin to all shared channels.
* auto-invite remotes to shared channels when flag set

server/channels/app/slashcommands/command_share_test.go

@@ -12,33 +12,32 @@ import (
 	"github.com/mattermost/mattermost/server/v8/channels/testlib"
 
 	"github.com/mattermost/mattermost/server/v8/channels/app"
-	"github.com/mattermost/mattermost/server/v8/platform/services/remotecluster"
 
 	"github.com/stretchr/testify/require"
 
 	"github.com/mattermost/mattermost/server/public/model"
 )
 
+func setupForSharedChannels(tb testing.TB) *TestHelper {
+	return setupConfig(tb, func(cfg *model.Config) {
+		*cfg.ExperimentalSettings.EnableRemoteClusterService = true
+		*cfg.ExperimentalSettings.EnableSharedChannels = true
+	})
+}
+
 func TestShareProviderDoCommand(t *testing.T) {
 	t.Run("share command sends a websocket channel converted event", func(t *testing.T) {
-		th := setup(t).initBasic()
+		th := setupForSharedChannels(t).initBasic()
 		defer th.tearDown()
 
 		th.addPermissionToRole(model.PermissionManageSharedChannels.Id, th.BasicUser.Roles)
 
-		mockSyncService := app.NewMockSharedChannelService(nil, app.MockOptionSharedChannelServiceWithActive(true))
+		mockSyncService := app.NewMockSharedChannelService(th.Server.GetSharedChannelSyncService())
 		th.Server.SetSharedChannelSyncService(mockSyncService)
-		remoteClusterService, err := remotecluster.NewRemoteClusterService(th.Server, th.App)
-		require.NoError(t, err)
 
-		th.Server.SetRemoteClusterService(remoteClusterService)
 		testCluster := &testlib.FakeClusterInterface{}
 		th.Server.Platform().SetCluster(testCluster)
 
-		err = remoteClusterService.Start()
-		require.NoError(t, err)
-		defer remoteClusterService.Shutdown()
-
 		commandProvider := ShareProvider{}
 		channel := th.CreateChannel(th.BasicTeam, WithShared(false))
 
@@ -61,24 +60,17 @@ func TestShareProviderDoCommand(t *testing.T) {
 	})
 
 	t.Run("unshare command sends a websocket channel converted event", func(t *testing.T) {
-		th := setup(t).initBasic()
+		th := setupForSharedChannels(t).initBasic()
 		defer th.tearDown()
 
 		th.addPermissionToRole(model.PermissionManageSharedChannels.Id, th.BasicUser.Roles)
 
-		mockSyncService := app.NewMockSharedChannelService(nil)
+		mockSyncService := app.NewMockSharedChannelService(th.Server.GetSharedChannelSyncService())
 		th.Server.SetSharedChannelSyncService(mockSyncService)
-		remoteClusterService, err := remotecluster.NewRemoteClusterService(th.Server, th.App)
-		require.NoError(t, err)
 
-		th.Server.SetRemoteClusterService(remoteClusterService)
 		testCluster := &testlib.FakeClusterInterface{}
 		th.Server.Platform().SetCluster(testCluster)
 
-		err = remoteClusterService.Start()
-		require.NoError(t, err)
-		defer remoteClusterService.Shutdown()
-
 		commandProvider := ShareProvider{}
 		channel := th.CreateChannel(th.BasicTeam, WithShared(true))
 		args := &model.CommandArgs{