Add display order compound fields

[scolapasta]

What this PR does / why we need it:
Adds ordering to the getter for compound values
Which issue(s) this PR closes:

• Closes Display Order not being returned correctly for Dataset Authors #12027

Special notes for your reviewer:
one line fix

Suggestions on how to test this:
if you can create a datset where the ordering is wrong before testing; then apply fix and confirm ordering is fixed

Does this PR introduce a user interface change? If mockups are available, please link/include them here:
no (besides a fix to the order)

Is there a release notes update needed for this change?:
no

Additional documentation:

[qqmyers]

Looks good - haven't tested.

[coveralls]

coverage: 24.231%. remained the same
when pulling bdbc7b8 on compound-field-ordering
into 70b6e26 on develop.

[github-actions]

📦 Pushed preview images as

ghcr.io/gdcc/dataverse:compound-field-ordering

ghcr.io/gdcc/configbaker:compound-field-ordering

🚢 See on GHCR. Use by referencing with full name as printed above, mind the registry name.