Summary:
Relax the restriction in `selectBy.isValidLink` so that summary tables can be linked by a column like other tables, except the `group` column. See the discussion on https://grist.slack.com/archives/C0234CPPXPA/p1651773623256959 (the replies are on the following message) for more info on this decision.
Tweaked `LinkingState.ts` since linking with summary tables can now involve a column.
Test Plan: Added a new nbrowser test and fixture checking the options to select by given a summary table with a few ref/reflist columns. Manually tested the behaviour of each option.
Reviewers: jarek
Reviewed By: jarek
Differential Revision: https://phab.getgrist.com/D3416