Feature/tta/free products

[TTA777]

Makes receipts use v2 endpoint instead
App now supports free products, when such products occur in the database

Verifying the status of a free purchase is blocked by backend 122, though it is not a requirement for this branch to function. The update to receipts, so it makes use of the v2 endpoint instead does, however, require a new deployment of the backend

[codecov]

Codecov Report

Merging #396 (aade6a9) into develop (2374f77) will decrease coverage by 0.47%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop     #396      +/-   ##
===========================================
- Coverage    50.52%   50.06%   -0.47%     
===========================================
  Files           95       96       +1     
  Lines         1611     1626      +15     
===========================================
  Hits           814      814              
- Misses         797      812      +15     

Flag	Coverage Δ
unittests	50.06% <0.00%> (-0.47%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/base/strings.dart	34.21% <0.00%> (ø)
lib/cubits/receipt/receipt_cubit.dart	100.00% <ø> (ø)
lib/data/repositories/v1/ticket_repository.dart	55.00% <0.00%> (ø)
lib/data/repositories/v2/receipt_repository.dart	0.00% <0.00%> (ø)
lib/models/purchase/payment.dart	0.00% <ø> (ø)
lib/models/purchase/payment_status.dart	0.00% <0.00%> (ø)
lib/models/purchase/single_purchase.dart	0.00% <0.00%> (ø)
lib/models/receipts/receipt.dart	6.66% <0.00%> (-2.43%)	⬇️
lib/service_locator.dart	0.00% <0.00%> (ø)
...dgets/components/tickets/swipe_ticket_confirm.dart	0.00% <0.00%> (ø)

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