Expose property annotations not applied

When I configuring a region configuration with the following `expose` property:
```json

"expose": {
"domain": "mydomain.fr",
"route": false,
"ingress": true,
"annotations": {
"route.openshift.io/insecureEdgeTerminationPolicy": "Redirect",
"route.openshift.io/termination": "edge"
}
}
```
The ingress created by the service does not include the provided annotations.

**Region configuration reference**: [docs/region-configuration.md](https://github.com/InseeFrLab/onyxia-api/blob/2ad04119d5599af2a66698314328d7d88419a3d4/docs/region-configuration.md)

onyxia-api: v4.7.0