Can't run multiple Plutip clusters as kupos share the same `%TMP%/kupo-db` directory

[Renegatto]

Currently when we attempt to run multiple Plutip clusters in parallel contracts fail with No utxos found.

The issue is in these lines:

startKupo cfg params = do
  tmpDir <- liftEffect tmpdir
  let
    workdir = tmpDir <</>> "kupo-db"

workdir will be the same for all kupo instances being run in the same test suite. Fix is simple - generate random kupo temp dir every time like this:

startKupo cfg params = do
  tmpDir <- liftEffect tmpdir
  workdir <- liftEffect $ (tmpDir <</>> _) <$> uniqueId "kupo-db"

[klntsky]

Thanks! I would approve a PR.

[Renegatto]

@klntsky here it is, please review: #1605