Refactor and test register

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#### [](https://app.codesee.io/r/reviews?pr=486&src=https%3A%2F%2Fgithub.com%2FAnalogIO%2Fcoffeecard_app) #### Legend

[codecov[bot]]

Codecov Report

Merging #486 (994ff1a) into develop (9eb0f34) will increase coverage by 0.34%. The diff coverage is 82.35%.

@@             Coverage Diff             @@
##           develop     #486      +/-   ##
===========================================
+ Coverage    72.19%   72.53%   +0.34%     
===========================================
  Files          108      112       +4     
  Lines         1158     1187      +29     
===========================================
+ Hits           836      861      +25     
- Misses         322      326       +4     

Flag	Coverage Δ
unittests	72.53% <82.35%> (+0.34%)	:arrow_up:

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

Impacted Files	Coverage Δ
...e/data/datasources/account_remote_data_source.dart	76.19% <ø> (+3.11%)	:arrow_up:
.../data/datasources/register_remote_data_source.dart	66.66% <66.66%> (ø)
...es/register/presentation/cubit/register_state.dart	71.42% <71.42%> (ø)
...atures/register/domain/usecases/register_user.dart	80.00% <80.00%> (ø)
...es/register/presentation/cubit/register_cubit.dart	100.00% <100.00%> (ø)