Improve type coverage for nested runtime

[raymyers]

• 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 this introduces.

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Summarize what the PR does, explaining any non-trivial design decisions.

Running a mypy html report, I found that we have lots of "Imprecision", things mypy cannot check. Adding more dependencies in the pre-commit config and adding type annotations on some untyped globals helps address this.

This PR cuts docker_nested_conversation_manager's imprecision (unchecked lines) in half from roughly 23% to 12%.

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Link of any specific issues this addresses:

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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:d0ffa2b-nikolaik   --name openhands-app-d0ffa2b   docker.all-hands.dev/all-hands-ai/openhands:d0ffa2b

[raymyers]

This one looks like it was a bug.

[tofarr]

Nice catch!

[tofarr]

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