Enable runtime image build for resolver's experimental feature

[ryanhoangt]

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

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

This PR is to enable runtime image build for resolver's experimental feature:

• fix-me-experimental label
• @openhands-agent-exp macro

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Link of any specific issues this addresses Fix https://github.com/All-Hands-AI/OpenHands/issues/5741

[malhotra5]

Thanks so much for doing this! There's a couple of minor changes I'd like to address, and will leave the comments in a couple of hours from now