E2E test flaky: TestRequestParking

[yufan-su]

The E2E test TestRequestParking added in #221 was flaky in ci

Sample failures:

• https://github.com/agent-substrate/substrate/actions/runs/30657328354/job/91244870748
• https://github.com/agent-substrate/substrate/actions/runs/30477187339/job/90661727410
• https://github.com/agent-substrate/substrate/actions/runs/30476804701/job/90660441335

--- FAIL: TestRequestParking (13.43s)
    --- FAIL: TestRequestParking/ParkThenServed (6.11s)
    --- PASS: TestRequestParking/BudgetExhaustion (5.06s)
FAIL

[zoez7]

Hey Omer Yahud (@omeryahud) Do you mind taking a look at this since you added the test? This is quite flaky and blocking many PRs.

[omeryahud]

Hey Omer Yahud (@omeryahud) Do you mind taking a look at this since you added the test? This is quite flaky and blocking many PRs.

Hi Zoe Zhao (@zoez7) !

I've replied on the linked PR (see above references), waiting for yufan-su's reply

[zoez7]

Thanks! Looks like yufan-su is out of office for the next week, do you mind taking over the PR Omer Yahud (@omeryahud) ?