Fix: Keeping runtimes alive again (For now)

[tofarr]

Runtimes will not be actively culled again (For now)

• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

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We will need to do a follow up fix here before we expose the multi conversation UI to everybody outside the feature flag.

The follow up fix will need to allow pausing / restarting of docker runtimes in a similar manner to the remote runtime.

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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:da50d57-nikolaik   --name openhands-app-da50d57   docker.all-hands.dev/all-hands-ai/openhands:da50d57

[mamoodi]

Should fix: #6382