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/platform/services/slackimport/main_test.go

@@ -0,0 +1,31 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slackimport
+
+import (
+	"fmt"
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	prevDir, err := os.Getwd()
+	if err != nil {
+		panic("Failed to get current working directory: " + err.Error())
+	}
+
+	err = os.Chdir("../..")
+	if err != nil {
+		panic(fmt.Sprintf("Failed to set current working directory to %s: %s", "../..", err.Error()))
+	}
+
+	defer func() {
+		err := os.Chdir(prevDir)
+		if err != nil {
+			panic(fmt.Sprintf("Failed to restore current working directory to %s: %s", prevDir, err.Error()))
+		}
+	}()
+
+	os.Exit(m.Run())
+}