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/slashcommands/command_open.go

@@ -0,0 +1,33 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/i18n"
+)
+
+type OpenProvider struct {
+	JoinProvider
+}
+
+const (
+	CmdOpen = "open"
+)
+
+func init() {
+	app.RegisterCommandProvider(&OpenProvider{})
+}
+
+func (open *OpenProvider) GetTrigger() string {
+	return CmdOpen
+}
+
+func (open *OpenProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Command {
+	cmd := open.JoinProvider.GetCommand(a, T)
+	cmd.Trigger = CmdOpen
+	cmd.DisplayName = T("api.command_open.name")
+	return cmd
+}