Add `step: action` to e2e tests for SELECT queries

[pkong-ds]

What's in this PR?

Add a new step to run a database query and assert the result

Why?

1. reauth need fetch user_id from db to generateIDToken
2. userimport needs to verify user attributes are populated correctly (uppercase/lowercase) in db

Usage example

Please see https://github.com/authgear/authgear-server/pull/4562/commits/28f884a9f658ca279b21bd056c98d6f06908c618 at PR #4562