proxy providers also listed as oauth2 providers

[sch0sven]

Describe the bug

When listing providers using the REST api, we see that proxy providers are also listed as oauth2 type providers.

To Reproduce
Steps to reproduce the behavior:

1. Query proxy providers:

   curl -H "Authorization: Bearer $AUTHENTIK_API_TOKEN" \
   'https://<someurl>/api/v3/providers/proxy/' | \
   jq -r '.results | .[] | [.pk, .name, .meta_model_name] | @tsv '
   1       prov1      authentik_providers_proxy.proxyprovider
   2       prov2      authentik_providers_proxy.proxyprovider
   9       prov3      authentik_providers_proxy.proxyprovider
   6       prov4      authentik_providers_proxy.proxyprovider

2. Query oauth2 providers:

   curl -H "Authorization: Bearer $AUTHENTIK_API_TOKEN" \
   'https://<someurl>/api/v3/providers/oauth2/' | \
   jq -r '.results | .[] | [.pk, .name, .meta_model_name] | @tsv '
   1       prov1      authentik_providers_oauth2.oauth2provider
   2       prov2      authentik_providers_oauth2.oauth2provider
   9       prov3      authentik_providers_oauth2.oauth2provider
   6       prov4      authentik_providers_oauth2.oauth2provider

3. Compare lists and observe: Same providers seem to have changed type.

Expected behavior

Disjunct lists.

Version and Deployment (please complete the following information):

• authentik version: first observer in 2024.8.1 but still observed in 2024.10.1
• Deployment: AWS ECS

Please let me know if I can provider additional information.