Add authentication support to execute_sparql_query

[LeMyst]

Summary

Allow wbi_helpers.execute_sparql_query() to query a SPARQL endpoint that sits behind authentication.

• New auth parameter: a (username, password) tuple for HTTP Basic auth, or any requests.auth.AuthBase instance.
• New headers parameter: extra HTTP headers merged over the defaults (e.g. {'Authorization': 'Bearer <token>'}).
• New wbi_config['SPARQL_AUTH'] key (default None), used when auth is not passed. The fast run mode picks it up without any change.

execute_sparql_query(query, auth=('user', 'password'))
execute_sparql_query(query, headers={'Authorization': 'Bearer <token>'})
wbi_config['SPARQL_AUTH'] = ('user', 'password')  # global, also used by fast run

Related changes in wbi_backoff

• The retry log handler printed every keyword argument of the retried function, which would have leaked credentials. The auth, headers and login kwargs are now masked as ***.
• HTTP 401/403 now gives up immediately instead of being retried with the same credentials. This applies to every @wbi_backoff() decorated function.

Test plan

• New unit tests: Basic auth, auth taken from config, no auth by default, extra headers (defaults kept), no retry on 401/403, credentials not logged
• Full offline suite: 260 passed, 2 skipped
• mypy: no issues

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