Docker: validate clangd version

Do not automatically setup a clangd that is too old and mark them as
invalid if they are manually selected.

Change-Id: Ie9662a8821df8fc678eabc4b8a08375723b4d1c3
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/clangutils.h

@@ -0,0 +1,20 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "utils_global.h"
+
+QT_BEGIN_NAMESPACE
+class QVersionNumber;
+QT_END_NAMESPACE
+
+namespace Utils {
+
+class FilePath;
+
+QTCREATOR_UTILS_EXPORT QVersionNumber clangdVersion(const FilePath &clangd);
+QTCREATOR_UTILS_EXPORT bool checkClangdVersion(const FilePath &clangd, QString *error = nullptr);
+QTCREATOR_UTILS_EXPORT QVersionNumber minimumClangdVersion();
+
+} // namespace Utils