No External Team/User Mappings for GitLab Integration

### Self-Hosted Version

22.8.0

### CPU Architecture

x86_64

### Docker Version

19.03.13

### Docker Compose Version

1.29.2

### Steps to Reproduce

We have tried with and without "Early Adopter".
Following the guide from the [External Team/User Mappings](https://docs.sentry.io/product/issues/issue-owners/#external-teamuser-mappings).
1. Settings
2. Integrations
3. GitLab
4. Configurations
5. Configure
6. ...

### Expected Result

Like in the [docs](https://docs.sentry.io/product/issues/issue-owners/#external-teamuser-mappings), we expect to see Code Mappings / User Mappings / Team Mappings tabs in the GitLab integration settings but there are only repositories.

### Actual Result

For some context, we have a self-managed GitLab instance, and it has been added in the Sentry without the GitLab Group Path. The GitLab installation has been added a lot of major versions ago and recently we have done a lot of upgrades and jumps in versions to the latest. The upgrades were done as per instructions with stops at the specified versions in the documentation. In the Integrations page, we see that GitLab (just like GitHub) has `Source Code Management, Issue Tracking, Stacktrace Link, Codeowners` features. Our main repository (which is added in the Repositories) has the `CODEOWNERS` feature enabled and is actively being used.

### Event ID

_No response_