Stdlib: DOM soft-null deprecation cites Zend stub param names (#31824)

[PurHur]

Summary

• Soft-null E_DEPRECATED for several DOM APIs cited default $value instead of Zend stub names ($qualifiedName, $filename, $feature, $version, $localName, $data).
• Pass stub names through DomClassMethod::stringArg() / VmDomJitDispatch::stringArg() for the methods in Regression: DOM soft-null deprecation cites $value — Zend stub names (qualifiedName/filename/feature/…) (ext/dom) #31824; add repro + VM/JIT compliance guard.
• php-src ref: ext/dom/php_dom.stub.php, ext/dom/namednodemap.c. No new runtime/*.c.

Closes #31824

Test plan

• ./script/docker-exec.sh -- bash -lc 'php test/repro/maintainer_gap_dom_soft_null_param_names.php'
• ./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_dom_soft_null_param_names.php'
• ./script/docker-exec.sh -- bash -lc 'php bin/jit.php test/repro/maintainer_gap_dom_soft_null_param_names.php'
• ./script/phpunit.sh --filter DomSoftNullParamNamesDeprecated → OK (2 tests)

Verification transcript (VM excerpt)

DEP:DOMNamedNodeMap::getNamedItem(): Passing null to parameter #1 ($qualifiedName) of type string is deprecated
DEP:DOMDocument::load(): Passing null to parameter #1 ($filename) of type string is deprecated
… (matches Zend 8.2.32)
ok

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