[v11.0.x] StateTimeline: Fix data links causing unrendering of string fields #85307
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Backport 1ffeb7c from #85260
fixes a regression introduced in #83654 causing string fields not to render in GraphNG-based panels when panel data links are added. the only panel that currently renders string fields is StateTimeline.
can be reproduced in http://localhost:3000/d/mIJjFy8Kz/timeline-demo?orgId=1
https://github.com/grafana/grafana/blob/main/devenv/dev-dashboards/panel-timeline/timeline-modes.json
Kooha-2024-03-27-08-14-24.webm