Reduce max iterations by default

[enyst]

• This change is worth documenting at https://docs.all-hands.dev/
• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

End-user friendly description of the problem this fixes or functionality that this introduces.

Set max iterations to 250 by default.

---

Give a summary of what the PR does, explaining any non-trivial design decisions.

This PR proposes to reduce max iterations to 250.

With Sonnet 3.7's energy, this does seem to go off quite a lot. We also had a fix meanwhile, where if the user speaks, the max iterations are added again on top of existing value, which gives more breathing room than 250 anyway.

With UI, hitting this only means that the user tells it to continue.

---

Link of any specific issues this addresses.

---

To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:60c1111-nikolaik   --name openhands-app-60c1111   docker.all-hands.dev/all-hands-ai/openhands:60c1111

[malhotra5]

Thanks! Seems like this is needed as of lately