release-20.2: sql/*: remove MakeTableName (without schema) function #61890
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Backport 1/2 commits from #61752.
/cc @cockroachdb/release
This made it very easy to forget to account for user-defined schemas.
Removing the function should prevent a big class of bugs.
This is broken up into 2 commits. The first fixes some cases that appeared
to me as if they'd benefit from looking up the schema name, and is intended
for a backport back to 20.2. The second commit is a refactor that removes the
non-schema MakeTableName function and probably doesn't need to be backported.
In addition to the release note below, this also fixes the error message
that would appear when trying to drop a role that owns a table in a
user-defined schema.
Release note (bug fix): Using EXPLAIN (OPT, ENV) on a query that
references a table in a user-defined schema would fail previously. This
is now fixed.