Remove `hstore_accessor` usage

The places we were using `hstore_accessor` have now been converted to
Postgres JSON fields. Thus we no longer need `hstore_accessor` in order
to add accessors for the fields.

Instead we can use Rails' built-in support for Postgres JSON fields and
create accessors for our JSON hash keys with `store_accessor`. We get
rid of the data types because `store_accessor` doesn't work like that
and JSON already types our values with primitive data types.

Finally, add some extra validation tests now that the vaildation for our
JSON fields should work.

Refs #5316

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