Eliminate MM_SERVER_PATH (#24968)

server/tests/path.go

@@ -0,0 +1,18 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package tests
+
+import (
+	"path/filepath"
+	"runtime"
+)
+
+// GetPackagePath returns the filepath to this package for use in tests that need to read data here.
+func GetPackagePath() string {
+	// Find the path to this file
+	_, filename, _, _ := runtime.Caller(0)
+
+	// Return the containing directory
+	return filepath.Dir(filename)
+}