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/utils/testutils/static_config_service.go

@@ -0,0 +1,33 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package testutils
+
+import (
+	"crypto/ecdsa"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+type StaticConfigService struct {
+	Cfg *model.Config
+}
+
+func (s StaticConfigService) Config() *model.Config {
+	return s.Cfg
+}
+
+func (StaticConfigService) AddConfigListener(func(old, current *model.Config)) string {
+	return ""
+}
+
+func (StaticConfigService) RemoveConfigListener(string) {
+
+}
+
+func (StaticConfigService) AsymmetricSigningKey() *ecdsa.PrivateKey {
+	return &ecdsa.PrivateKey{}
+}
+func (StaticConfigService) PostActionCookieSecret() []byte {
+	return make([]byte, 32)
+}