[TRI-1449] Display warning message when duplicate job IDs are detected

[ericallam]

It's quite easy to accidentally reuse a job ID:

// foo.ts
client.defineJob({
  id: "do-something",
});

// bar.ts
client.defineJob({
  id: "do-something",
})

We should detect when this happens and display a warning in the users local server console.

_TRI-1449