Make utility for common integration test setup

[kchadha]

@mzgoddard noted that code snippets like the one below are used throughout several integration tests. Make a common utility to abstract this out for easy test setup.

const vm = new VirtualMachine();
    vm.attachStorage(makeTestStorage());

    // Start VM, load project, and run
    t.doesNotThrow(() => {
        vm.clear();
        vm.setCompatibilityMode(false);
        vm.setTurboMode(false);

        vm.loadProject(project).then(() => {