Stdlib: VmDirOpenFailure SSOT — data:// scandir + errno followup (#18418)

[PurHur]

Summary

Follow-up to merged #18420/#18418 core fix — remaining php-src-strict gaps:

• data:// URIs — scandir() now emits not implemented + (errno 0): Success instead of No such file or directory (host scandir short-circuited in VmDirNative).
• Missing path errno — VM scandir() now emits second warning scandir(): (errno 2): No such file or directory matching Zend (was VM-only single warning).
• SSOT — VmDirOpenFailure + ScandirFailureJitHelper unify VM/JIT dir-open diagnostics; VmFsPhpWrapper::openDirFailureReason() delegates.

Verification

./script/phpunit.sh --filter "scandir_dir_open_errno|scandir_filter_wrapper"
# OK (4 tests, 4 assertions)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php -r "@scandir(\"data://text/plain,hello\");" 2>&1
php bin/vm.php -r "@scandir(\"/nonexistent\");" 2>&1'

Relates to #18418 (core merged in #18420).

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