R1:32da29b96569

Provide more help around GRANT errors, particularly for missing TEMPORARY TABLE permission

Summary:
Fixes T13622. Figuring out what permissions we have seems difficult, so address this a bit more narrowly:

- Make the "access denied" error message a bit more helpful.
- Tailor error handling for the "CREATE TEMPORARY TABLE" statement.

Test Plan:
- Created a new user, granted them "SELECT ON *.*" but not "CREATE TEMPORARY TABLE", ran `bin/storage upgrade --force --apply phabricator:20210215.changeset.