chore: drop stale mysqli maintainer_gap repros for closed issues

[PurHur]

Summary

• Drop 9 VM-green test/repro/maintainer_gap_mysqli_* scripts for closed mysqli registration issues, each already covered by compliance guards:
  • Stdlib: mysqli_stmt_get_result() / mysqli_stmt::get_result() missing (ext/mysqli/mysqli.stub.php) #22162 → mysqli_stmt_get_result.phpt
  • Stdlib: mysqli_stmt_attr_get()/mysqli_stmt_attr_set() missing (ext/mysqli/mysqli.stub.php) #22175 → ext/mysqli/mysqli_stmt_attr_get_set.phpt
  • Stdlib: mysqli_insert_id()/field_count()/sqlstate()/get_server_info()/ssl_set() missing (ext/mysqli/mysqli.stub.php) #22194 → mysqli_conn_info.phpt
  • Stdlib: mysqli_fetch_all()/fetch_object()/fetch_field*()/data_seek() missing (ext/mysqli/mysqli.stub.php) #22195 → mysqli_fetch_metadata.phpt
  • Stdlib: mysqli_poll() / mysqli_reap_async_query() missing — async query API (ext/mysqli/mysqli.stub.php) #22163 → ext/mysqli/mysqli_poll_reap_async.phpt
  • Stdlib: mysqli_stmt_field_count()/errno()/error()/sqlstate()/result_metadata() missing (ext/mysqli/mysqli.stub.php) #22193 → mysqli_stmt_introspection.phpt
  • Stdlib: mysqli_use_result()/mysqli_more_results() missing after multi_query (ext/mysqli/mysqli.stub.php) #22184 → mysqli_use_result_more_results.phpt
  • Stdlib: ext/mysqli phase 1b — mysqli_sql_exception/mysqli_init()/mysqli_driver missing; OOP new mysqli() fatals (ext/mysqli/mysqli.c, post-#21787) #21803/Regression: uninitialized mysqli::query() throws LogicException — Zend mysqli_sql_exception (ext/mysqli/mysqli_api.c) #21815 → mysqli_sql_exception_init.phpt + mysqli_uninitialized_sql_exception.phpt
• Separately (no code): stripped implementation-ready from 12 Parity backlog snapshot meta issues; noted agent/issue-22642-gen0-refresh-oom cooling on Bootstrap: unblock gen-0 spine refresh — docblock, ghost require, exclusive launcher (#22642) #22717.

Test plan

• php bin/vm.php on each deleted repro → green before delete (./script/docker-exec.sh)
• Compliance guards present on master
• No unit/Makefile references to deleted paths
• Merge when green

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