[Discover] Fix failing _shared_links.ts cloud tests

[davismcphee]

Summary

WIP.

Fixes #130211.

Checklist

• [ ] Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• [ ] Documentation was added for features that require explanation or tutorials
• [ ] Unit or functional tests were updated or added to match the most common scenarios
• [ ] Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• [ ] Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• [ ] If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• [ ] This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• [ ] This was checked for cross-browser compatibility

For maintainers

• [ ] This was checked for breaking API changes and was labeled appropriately

[kibana-ci]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: 8183a6de789d334b2d2abce3b955c2966451d6f7

Metrics [docs]

✅ unchanged

To update your PR or re-run it, just comment with: @elasticmachine merge upstream

cc @davismcphee