Mock server: update introspection query & userprofile responses

[MetRonnie]

These had drifted out of date with the schema and jupyter server respectively.

Check List

• [x] I have read CONTRIBUTING.md and added my name as a Code Contributor.
• [x] Contains logically grouped changes (else tidy your branch by rebase).
• [x] Does not contain off-topic changes (use other PRs for other changes).
• [x] Tests are updated
• [x] No need for changelog entry as minor