Log raw NotFound detail in _read_schema

[Gutts-n]

Why

Follow-up to #25 (wired LOG_LEVEL). With DEBUG logging actually working
now, confirmed the ckan:resource-update-stress 404 still shows up only
as the generic wrapped message ("Not Found") at the error-handler layer
— because _read_schema's except NotFound: return None never captured
or logged the original exception at all. There was nothing more to see
at any log level, by design of this specific except clause, not because
logging was misconfigured.

What changed

datastore/infrastructure/engines/bigquery/backend.py: _read_schema's
NotFound handler now logs the resource_id, the exact table ref queried,
and the raw exception (%s on the NotFound instance includes Google's
response body) at DEBUG before returning None. Still returns None
for the caller exactly as before — behavior unchanged, only adds
visibility.

What was verified

• Ran the full test suite (pytest tests/ -k "not integration"):
  494 passed, same as baseline, same two pre-existing unrelated
  failures in tests/test_datastore_dump.py excluded (confirmed
  pre-existing on main in Wire LOG_LEVEL config into logging.basicConfig #25).
• Ran tests/engines/bigquery/ specifically: 94 passed.

Context

Investigating a persistent datastore_search 404 for resources that
have real, verified data in BigQuery — datastore_authorize succeeds,
IAM checks out with the same read-only service account, and a fresh
BigQuery client can query the same table instantly, but the live service
consistently 404s. google.api_core.exceptions.NotFound from
tables.get was the confirmed source of the 404, but its detail was
never captured anywhere in the request path. This PR closes that gap —
next occurrence of this bug should show the real Google API response.

Deployment

Needs a rebuild + redeploy of the datastore image, same as #25.

[coderabbitai]

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