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/playbooks/server/api_general_test.go

@@ -0,0 +1,23 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package main
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAPI(t *testing.T) {
+	e, teardown := Setup(t)
+	defer teardown()
+	e.CreateClients()
+
+	t.Run("404", func(t *testing.T) {
+		resp, err := e.ServerClient.DoAPIRequestBytes("POST", e.ServerClient.URL+"/plugins/"+"playbooks"+"/api/v0/nothing", nil, "")
+		assert.Error(t, err)
+		assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+	})
+}