API to paginate through space labels is broken

Issue Summary

The Get Space Labels (GET /wiki/rest/api/space/{spaceKey}/label) API does not work properly with regard to pagination.

Steps to Reproduce

1. Ensure a space EXAMPLE in tenant https://example.atlassian.net has multiple labels.
2. GET https://example.atlassian.net/wiki/rest/api/space/EXAMPLE/label?start=0&limit=1
3. GET https://example.atlassian.net/wiki/rest/api/space/EXAMPLE/label?start=1&limit=1
4. Compare the label retrieved at steps 2 and 3.

Expected Results

The labels returned are different.

Actual Results

The labels returned are identical.

Workaround

None