fix(frontend): make inconsistent group dosing an error

[eatyourgreens]

Error during stratification if group dosing is inconsistent, so that the dataset can't be uploaded.

[sonarcloud[bot]]

Quality Gate passed for 'pkpdapp'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.26%. Comparing base (28944d1) to head (edb2b5e). Report is 64 commits behind head on development.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #508 +/- ## =============================================== - Coverage 76.88% 76.26% -0.62% =============================================== Files 108 108 Lines 5593 5591 -2 =============================================== - Hits 4300 4264 -36 - Misses 1293 1327 +34 ```

:umbrella: View full report in Codecov by Sentry.
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[sonarcloud[bot]]

Quality Gate passed for 'pkpdapp-team_pkpdapp_frontend'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud