Feature/2219 Diversity Checkpoints report (#2249)

* add change to diversity report

* tidy up

* update text

* update change in diversity report

* wip

* update style

* move calculation to backend

* refactor report

* update report style

* update jac-kit version

* update style

* update commissioner's name

* use-sanitise-xlsx

* Revert "Bump version number to 1.76.0"

This reverts commit ec66b90.

* revert

* fix

* update styles

* remove yellow background

* upgrade jac-kit to 4.1.46

* tidy up

* update package-lock.json

* tidy up

* add exercise reference number

---------

Co-authored-by: Tom Russell <TR115251@hotmail.co.uk>