[Bug]: /logs/poll fails with 500 if passing a bad next_token

[r4victor]

Steps to reproduce

Pass an invalid next_token to /api/project/main/logs/poll with file logs enabled:

{
	"run_name": "aaa",
	"job_submission_id": "dd39819f-fc4b-431d-9d8a-03b690806fd7",
	"next_token": -1
}

The server will return 500 and print and exception:

dstack._internal.server.services.logs.base.LogStorageError: Invalid next_token: -1. Must be a non-negative integer.

Actual behaviour

No response

Expected behaviour

No response

dstack version

master

Server logs

Additional information

No response