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/store/storetest/utils.go

@@ -0,0 +1,21 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package storetest
+
+import (
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+// This function has a copy of it in app/helper_test
+// NewTestId is used for testing as a replacement for model.NewId(). It is a [A-Z0-9] string 26
+// characters long. It replaces every odd character with a digit.
+func NewTestId() string {
+	newId := []byte(model.NewId())
+
+	for i := 1; i < len(newId); i = i + 2 {
+		newId[i] = 48 + newId[i-1]%10
+	}
+
+	return string(newId)
+}