duckdb-azure's glob() can't list OneLake (abfss://) directories
(duckdb/duckdb-azure#174, unreleased): glob('<schema>/*') returns zero rows, so
glob-based relation discovery came back empty and standalone read-only commands
(dbt test/show/docs) failed with "schema does not exist" for every model. dbt
build masked it because the materialization creates the delta_scan views itself.

For abfss:// stores, enumerate the schema's table directories with the OneLake /
ADLS Gen2 DFS "List Paths" REST API (new remote.py), using the same bearer token
that authenticates the Delta reads/writes. Local and az:// stores keep using
DuckDB glob, which works there. Verified locally: standalone `dbt test` against
real OneLake now PASS=25 ERROR=0 (was: every test ERROR).

Also revert the forced curl azure transport in secret.py: it's not the fix and it
breaks non-Linux hosts (CURLE 43); delta_scan works on the default transport.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>