Add rollback functionality when saving FHIR bundle with metadata

[BobanL]

What needs to be done

• Add rollback functionality to handle if either FHIR bundle or metadata save fail.

Why it needs to be done

• Currently either the FHIR bundle save or metadata save steps could fail without rolling back the other

Acceptance Criteria

• When saveFhirData then no metadata should be saved
• When saveFhirMetadata then no bundle should be saved

Technical Notes

• Consider using Promise.allSettled instead of Promise.all to check if either process failed.

Additional context

[OPTIONAL, delete if not needed]
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