src/vs/platform/extensions/common/extensions.ts/getWorkpaceSupportTypeMessage
export function getWorkpaceSupportTypeMessage(supportType: ExtensionUntrustedWorkspaceSupport | ExtensionVirtualWorkpaceSupport | undefined): string | undefined {
	if (typeof supportType === 'object' && supportType !== null) {
		if (supportType.supported !== true) {
			return supportType.description;
		}
	}
	return undefined;
}