Lens visualization upgraded from 7.5 shows empty dimension panels and broken series names

[flash1293]

Kibana version: 7.7.0 BC 1

Elasticsearch version: 7.7.0 BC 1

Describe the bug: When saving a Lens visualization in 7.5 and upgrading to 7.7, some visualizations show weird behavior - series labels in XY charts contain a uuid and empty dimension panels are rendered.

Steps to reproduce:

1. Open Lens in 7.5
2. Create an xy chart with date histogram on the x axis and a split series by terms with count on the y axis and save
3. Create an xy chart with date histogram on the x axis and count on the y axis and save
4. Upgrade to 7.7
5. Open the visualization
6. Series labels contain a uuid and empty dimension panels are rendered.

Expected behavior:
Should look like in 7.5

Screenshots (if relevant):

Errors in browser console (if relevant):

Provide logs and/or server output (if relevant):

Any additional context:
Saved objects after migration:
https://gist.github.com/flash1293/c0be2cb3af95ebef188e9dbfcd8d86eb
https://gist.github.com/flash1293/6744332aa404e16ebcd3932067048c71

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[wylieconlon]

I think I know what's happening here, and I think it's because I removed a check in the renderer. The check previously tested whether the datasource was aware of the columnId, and if it's missing then it gets removed from the configuration. This is on me to fix.

[wylieconlon]

Fixed by #62877 for 7.7, working on a separate change for 7.8 and master: #62879