fix: Watch log hangs when we're in a terminal state

[tomasmik]

If we have no more logs and we're in a terminal state, don't wait for more, just exit. This fixes the problem of local preview not exiting.

....
╷
│ Error: Unsupported block type
│
│   on main.tf line 1:
│    1: aarsource "random_string" "random" {
│
│ Blocks of type "aarsource" are not expected here.
╵

[01J6F1AVF3VFZ7NZ7K4EMEKMW6] Unexpected exit code when initializing workspace: 1

-----------------
FAILED	Thu Aug 29 15:35:31 EEST 2024
-----------------

View full logs at http://*.app.spacelift.tf/stack/doublestack/run/01J6F2462RPSAPFCRY6GMP2FPT
2024/08/29 15:35:32 finished with FAILED state
➜  $

This was reported by a customer.

Closes: #250

[mbialon]

Is the goal to exit when we fetch all logs for a terminal transition? Because we can't rely on the Finished flag.