Enable persistence for OpenHands cloud by default

[rbren]

Description

Helm Chart Checklist

• I have updated the version field in Chart.yaml for each modified chart
• I have tested the chart upgrade path from the previous version
• I have verified backwards compatibility with existing values.yaml configurations
• I have updated the chart's README.md if there are any breaking changes or new required values

Additional Notes

[openhands-ai]

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

• GitHub Actions are failing:
  • Pull Request Checks

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

@OpenHands please fix the failing actions on PR #173 at branch `rbren-patch-4`

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

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