Summary:
When linking table to a summary, the linking ended up broken after updating the summary group by columns.
This diff fixes that issue.
There were two issues:
1) some subscriptions were missing due to some .peek() calls instead of directly calling the observable.
2) the LinkingState instance was not being disposed.
3) the filterColValues was not updating after source data table has been loaded
Test Plan: Include new test file.
Reviewers: alexmojaki
Reviewed By: alexmojaki
Subscribers: paulfitz
Differential Revision: https://phab.getgrist.com/D3358
bf8769bc42