Column types not showing within shared tables and explorations

[seancolsen]

Steps to reproduce

1. Create a table share

2. View the shared table page

3. Within the column header cells, expect to see type icons alongside the column names.

4. Instead, observe question marks for all columns.

5. Expect to see numbers right-aligned.

6. Instead, see numbers left-aligned (because they are being treated as text).

   

[pavish]

Same root cause as #3452