SWT-bench: cache preload, latency instrumentation, pydantic-core bump

[simonrosenberg]

Summary

• Fix SWT-Bench eval import path by adding repo src/ to sys.path (unblocks harness)
• Wire cache/cost/timing improvements for SWT-Bench (preload cache & docker images via eval pipeline)
• Bump pydantic-core dependency as requested

Testing

• Evaluation workflow: run 20705519234 (swtbench) completed successfully; produced docker image cache and report

Fixes #234

[openhands-ai]

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

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

@OpenHands please fix the failing actions on PR #245 at branch `feature/swtbench-latency`

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

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