test(bundle): coverage for `cargo` presence check

[lowlighter]

There are missing coverage about the branch that check whether cargo is installed or not on the machine.

We essentially need to find a way to throw Deno.errors.NotFound when spawning cargo, but couldn't find a way to make it work (in Windows at least) to "remove" cargo from path, even passing the env var as empty had no effect

test("deno")("bundle() throws when cargo is not installed", async () => {
  await expect(bundle(project, { autoinstall: false, loglevel: 0, env: { PATH: "" } })).not.resolves.toThrow()
}, { permissions: { read: true, run: true } })