Summary:
Currently actions blocked early because they could modify the
schema (e.g. changing formulas) do not report memo information
(comments in relevant rules). This diff fixes that by using
more of the same code path in the two situations. It also
adds information about what type of action was blocked to
error messages.
Test Plan: extended a test
Reviewers: dsagal
Reviewed By: dsagal
Differential Revision: https://phab.getgrist.com/D2995
b3636b97e2