Fix rule import

[kfdm]

- Add test cases for each scenario
- Refactor settings for add_user_permissions
- Ensure rule is registered with correct ContentType

[codecov-io]

Codecov Report

Merging #165 into master will increase coverage by 0.66%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   46.41%   47.07%   +0.66%     
==========================================
  Files          43       42       -1     
  Lines        2424     2411      -13     
==========================================
+ Hits         1125     1135      +10     
+ Misses       1299     1276      -23

Impacted Files	Coverage Δ
promgen/views.py	50.43% <100%> (+1.8%)	⬆️
promgen/migrations/0010_app_label_migration.py
promgen/prometheus.py	60.92% <0%> (+0.66%)	⬆️
promgen/templatetags/promgen.py	40.2% <0%> (+1.03%)	⬆️
promgen/forms.py	94.38% <0%> (+5.61%)	⬆️

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