Stdlib: GlobIterator empty pattern ValueError cites $pattern (#31529)

[PurHur]

Summary

• new GlobIterator('') now throws Zend-shaped ValueError: … Argument #1 ($pattern) cannot be empty instead of generic Path cannot be empty.
• Null soft-deprecation also cites $pattern (was $filename).
• Same helper family as Regression: DirectoryIterator family null path ValueError generic Path — Zend Argument #1 ($directory) (ext/spl/spl_directory.c) #31512/Stdlib: DirectoryIterator family empty path cites $directory (#31512) #31525 (VmStreamPath::coerceNonEmptyPathArg + VmString::emptyStringArgValueErrorMessageCannot).

Closes #31529

Test plan

• ./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_globiterator_empty_pattern.php' → Zend-identical ValueError
• Null soft-DEP cites $pattern then same ValueError
• vendor/bin/phpunit --filter Issue31529GlobIteratorEmptyPatternTest

php-src ref: ext/spl/spl_directory.c / spl_directory.stub.php — string $pattern. PHP impl: ext/spl/GlobIteratorBuiltin.php.

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