amazon-aurora / babelfish_extensions / 30593880146

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BABEL-5975: Add orig_name column to babelfish_sysdatabases and bbf_cur_db()

- Add orig_name column to sys.babelfish_sysdatabases for original DB name
- Implement bbf_cur_db() to return original-case database name
- Rename sys.sysdatabases and sys.pg_namespace_ext views (add _deprecated)
- Recreate all dependent views after rename (identity_columns, all_sql_modules,
  sp_tables_view, sp_columns_100_view, triggers, columns_internal, etc.)
- Save/restore user-created views dependent on sysdatabases
- sp_stored_procedures_view: use babelfish_function_ext.orig_name
- Grammar: capture original DB name in CREATE DATABASE
- Upgrade SQL with full dependency chain management
- Tests: long-identifiers-databases, BABEL-ROLE-MEMBER, case_insensitive_collation
- Fix BABEL-6814 EXPLAIN plan (disable bitmapscan for Test 21)

Signed-off-by: anju15bharti <abanju@amazon.com>

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