Not Possible to retrieve Space Labels from V2 API

Issue Summary

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Use the V1 spaces API to retrieve labels directly associated with the space (`wiki/rest/api/space?expand=metadata.labels`)
2. Try to do the same with V2

Expected Results

There should be a way to fetch the labels directly associated with the space in the V2 API.

Actual Results

There is no way to fetch the labels directly associated with the space in the V2 API.

Workaround

Continue to use the V1 endpoints, which are deprecated. This is not a valid workaround for long, since these endpoints will soon no longer be accessible.