Internal group membership is being overridden with OIDC groups

### Current Behavior

Internal group membership is being overriden with OIDC groups.

### Steps to Reproduce

1. Setup a keycloak
2. Add group mapper for keycloak client
3. login with keycloak
4. add internal group along with OIDC group
5. Re-login
6. See only OIDC groups are available

### Expected Behavior

Internal group membership is persistant along with OIDC groups.

### Dependency-Track Version

4.6.3

### Dependency-Track Distribution

Container Image

### Database Server

PostgreSQL

### Database Server Version

14

### Browser

Mozilla Firefox

### Checklist

- [X] I have read and understand the [contributing guidelines](https://github.com/DependencyTrack/dependency-track/blob/master/CONTRIBUTING.md#filing-issues)
- [X] I have checked the [existing issues](https://github.com/DependencyTrack/dependency-track/issues) for whether this defect was already reported