Add Multi-SWE-bench image build support

[simonrosenberg]

Summary

• Enable Multi-SWE-bench builds in the SWE-Bench build workflow.
• Support ByteDance-Seed/Multi-SWE-bench dataset formatting for builds.
• Ensure image builds push to GHCR so remote runs can pull.

Validation

• software-agent-sdk run-eval.yml run: 20567580750
• evaluation workflow run: 20567583080
• benchmarks build workflow run: 20567611098

Artifacts

• gs://openhands-evaluation-results/eval-20567583080-claude-son_litellm_proxy-claude-sonnet-4-5-20250929_25-12-29-08-15.tar.gz
• gs://openhands-evaluation-results/artifacts/eval-20567583080-claude-son/

[openhands-ai]

Looks like there are a few issues preventing this PR from being merged!

• GitHub Actions are failing:
  • Pre-commit checks

If you'd like me to help, just leave a comment, like

@OpenHands please fix the failing actions on PR #219 at branch `add-multiswebench-to-ci`

Feel free to include any additional details that might help me get this PR into a better state.

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