[AnVIL DX] Update ordering and wording of cohort and dataset export options

[MillenniumFalconMechanic]

Description

We need to make several updates to the cohort and dataset exports list to improve clarity and consistency.

Changes Required

1. Reorder export options

   • Move "Export to Terra" to the top of the list for:
     • Cohort exports
     • Dataset exports

2. Update cohort export card wording

   • Revise the text for the cURL export card (cohort) to improve clarity and usability. Confirm text with @NoopDog.

3. Update cohort manifest export wording

   • Revise the text for the manifest export card (cohort). Confirm text with @NoopDog.