Project supported features: Ignore old 'Vulkan Clustered/Forward' names

This eases transition from beta 1 to beta 2 so that users don't get a warning
about a missing feature. The names were just changed.

The old feature names are removed from project.godot when opening such a
project.

core/config/project_settings.cpp

@@ -119,6 +119,10 @@ const PackedStringArray ProjectSettings::get_unsupported_features(const PackedSt
 	PackedStringArray supported_features = singleton->_get_supported_features();
 	for (int i = 0; i < p_project_features.size(); i++) {
 		if (!supported_features.has(p_project_features[i])) {
+			// Temporary compatibility code to ease upgrade to 4.0 beta 2+.
+			if (p_project_features[i].begins_with("Vulkan")) {
+				continue;
+			}
 			unsupported_features.append(p_project_features[i]);
 		}
 	}