refactor: schema-api test: consolidate Util usage and eliminate code duplication (#18562)

refactor(schema_api): consolidate Util usage and eliminate code duplication

This refactoring improves the schema_api_test_suite.rs file by leveraging the
existing Util struct more consistently across test functions.

Key improvements:
- Replaced 8+ instances of redundant Tenant::new_or_err() calls with util.tenant()
- Converted manual CreateDatabaseReq patterns to util.create_db() calls
- Eliminated redundant Util instance creation within functions
- Fixed tenant creation inconsistencies across multiple test functions

Functions refactored:
- table_gc_out_of_retention_time
- database_gc_out_of_retention_time
- table_history_filter
- table_history_filter_with_limit
- table_commit_table_meta
- database_create_get_drop
- gc_dropped_db_after_undrop
- dictionary_create_list_drop
- table_create_get_drop
- list_db_without_db_id_list

Benefits:
- Reduced code duplication by ~20-30 lines
- Improved maintainability and consistency
- Simplified test setup from 10-15 lines to 3-5 lines per function
- All 71 integration tests continue passing

No functional changes - purely structural improvements for better maintainability.

Author: drmingdrmer