Move cluster, webhub and store out of Server (#20899)

app/platform/utils.go

@@ -0,0 +1,22 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package platform
+
+import (
+	"crypto/sha256"
+	"encoding/base64"
+)
+
+func getKeyHash(key string) string {
+	hash := sha256.New()
+	hash.Write([]byte(key))
+	return base64.StdEncoding.EncodeToString(hash.Sum(nil))
+}
+
+func maxInt(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}