Stdlib: Soap\Url / Soap\Sdl on PROFILE=8.4+ (#23230)

[PurHur]

Summary

• Register final internal Soap\Url / Soap\Sdl when soap is advertised on language profile ≥8.4 (php-src 8.4 resource→object; child of Stdlib: ext/soap — SoapClient subset (ext/soap parity) #3724)
• Reject userland new via ReservedBuiltinClass (Cannot directly construct Soap\Url / Soap\Sdl)
• Withhold on reference 8.2 phantom gate; factories ready for later $httpurl / $sdl property wiring

php-src: ext/soap/soap.stub.php, ext/soap/soap.c (soap_url_object_get_constructor)
PHP-in-PHP: ext/soap/VmSoapOpaque.php + SoapExtensionPolicy::advertisesOpaqueUrlSdlTypes() — no new runtime/*.c

Closes #23230

Test plan

• PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_soap_url_sdl_84.php → ok
• reference: Soap\Url / Soap\Sdl class_exists false (phantom phpt)
• vendor/bin/phpunit --filter SoapExtensionPolicyTest OK
• PHP_COMPILER_PROFILE=8.4 vendor/bin/phpunit --filter soap_url_sdl OK (VM+JIT)
• php script/bootstrap-inventory.php --check OK 6562/6562
• php script/check-selfhost-spine-coverage-sync.php OK

Verification transcript

PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_soap_url_sdl_84.php
ok

PHP_COMPILER_PROFILE=8.4 vendor/bin/phpunit --filter soap_url_sdl
OK (2 tests, 2 assertions)

vendor/bin/phpunit --filter SoapExtensionPolicyTest
OK (2 tests, 20 assertions)

php script/bootstrap-inventory.php --check
OK 6562/6562

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