CAPT 1941/admin date formats

[rjlynch]

Standardise dates in the admin area

Requirement is to standardise on %d/%m/%Y when displaying dates in the
admin area. We've added a new locale format admin_date which we now
use throughout the admin area when displaying a date or datetime.

[github-actions]

Deployments

Journey	URL
Additional Payments	https://claim-additional-payments-for-teaching-review-3494-web.test.teacherservices.cloud/additional-payments/claim
Student Loans	https://claim-additional-payments-for-teaching-review-3494-web.test.teacherservices.cloud/student-loans/claim
Further Education	https://claim-additional-payments-for-teaching-review-3494-web.test.teacherservices.cloud/further-education-payments/landing-page
Early Years Payment	https://claim-additional-payments-for-teaching-review-3494-web.test.teacherservices.cloud/early-years-payment/landing-page
Relocation Payments	https://claim-additional-payments-for-teaching-review-3494-web.test.teacherservices.cloud/get-a-teacher-relocation-payment/landing-page
Admin	https://claim-additional-payments-for-teaching-review-3494-web.test.teacherservices.cloud/admin

[slorek]

To confirm, the PR description is out of date at time of writing. The new agreed date format is “Day Month-name Year” (eg 8 January 2025)