OracleMetadataProvider uses USER_* views while legacy OracleSchemaManager uses ALL_* views, causing introspectTableByUnquotedName() to fail when session user ≠ schema owner

Bug Report

Q	A
Version	4.4.1
Previous Version if the bug is a regression	N/A

Summary

Inconsistent behavior between deprecated SchemaManager API and the new introspectTableByUnquotedName() when Oracle session user differs from schema owner.

Current behavior

introspectTableByUnquotedName() queries USER_* views and fails with TableDoesNotExist when session user ≠ schema owner.

Steps to reproduce

1. Oracle DB with schema owner user SCHEMA_OWNER.
2. Connect DBAL with a different session user (e.g., DBA proxy or application user) that has privileges on SCHEMA_OWNER's tables, with dbname = 'SCHEMA_OWNER'.
3. Call $schemaManager->tablesExist(['my_table']) → returns true (uses ALL_TABLES WHERE OWNER = 'SCHEMA_OWNER').
4. Call $schemaManager->introspectTableByUnquotedName('my_table') → throws TableDoesNotExist (uses USER_TAB_COLUMNS which only sees the session user's own tables)

Expected behavior

Should use ALL_* views scoped by OWNER, consistent with tablesExist() and introspectTable().