chore: drop stale ldap/grapheme/setHook maintainer_gap repros for closed issues

[PurHur]

Summary

• Drop 4 VM-green test/repro/maintainer_gap_* scripts for closed issues already covered by compliance guards:
  • Regression: extension_loaded('ldap') true on reference profile without ext/ldap module (ext/ldap/php_ldap.c) #18211 → stdlib/ldap_extension_loaded_phantom_reference.phpt
  • Stdlib: grapheme_* function_exists true on 8.4 forward profile without ext/intl (ext/intl/php_intl.c) #17694 → stdlib/grapheme_phantom.phpt (+ profile forward guards)
  • Regression: grapheme_levenshtein() phantom on all profiles — Zend/php-src never ships it (ext/intl/grapheme) #22661 → stdlib/grapheme_levenshtein_forward_profile.phpt
  • Regression: ReflectionProperty::setHook() phantom on PROFILE=8.4 — Zend undefined (re-#22116, ext/reflection/php_reflection.c) #22494 → stdlib/reflection/reflection_property_sethook_phantom.phpt
• Separately (no code): deleted local merged chore/cleanup-stale-repros-jul25-mysqli; left agent/issue-22642-gen0-refresh-oom (<7d cool-down) and active agent/runtime-php-envlocal-jitvmhelper (php-in-php: JitEnvLocalKernel NestedJIT → JitVmHelperLink::ensureCompiled (#1492) #23211).

Test plan

• php bin/vm.php on each deleted repro → green before delete (./script/docker-exec.sh; PROFILE=8.4 for grapheme forward + setHook)
• Compliance guards present on master
• No unit/Makefile references to deleted paths
• Merge when green

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