Expand Manage Users CSV export

[rosalanghammer]

Request from community to expand to include'

• Age of child (not necessary to include parent email
• Parent name

[Wardormeur]

As per https://github.com/CoderDojo/community-platform/issues/1095, parent email is already exported. Is there an issue with existing export?

[rosalanghammer]

Sorry edited to reflect the actual request Doh

[all-self-taught]

I added a pull request for this request, branch addExportAge.

[Wardormeur]

Review and merged, thanks !