src/vs/workbench/services/extensionManagement/common/extensionManagementService.ts/ExtensionManagementService/installExtensions
class ExtensionManagementService:	async installExtensions(extensions: IGalleryExtension[], installOptions?: InstallOptions): Promise<ILocalExtension[]> {
		if (!installOptions) {
			const isMachineScoped = await this.hasToFlagExtensionsMachineScoped(extensions);
			installOptions = { isMachineScoped, isBuiltin: false };
		}
		return Promises.settled(extensions.map(extension => this.installFromGallery(extension, installOptions)));
	}