Stdlib: withhold soap on reference profile without host php-soap (#22859)

[PurHur]

Summary

• Gate ext/soap advertisement on host extension_loaded('soap') or PHP_COMPILER_PROFILE=8.4 (CompilerVersion::supportsSoap()), matching Zend builds without php-soap.
• Withhold SoapClient/SoapServer/SoapFault, is_soap_fault/use_soap_error_handler, and module registration on the reference harness; skip functional soap PHPTs until advertised (phantom kept).
• php-src: ext/soap/soap.c; PHP in ext/soap + BuiltinIntrospectionPolicy / ModuleRegistry.

Closes #22859

Test plan

• php bin/vm.php test/repro/extension_loaded_soap_phantom.php → all no (matches Zend)
• PHP_COMPILER_PROFILE=8.4 php bin/vm.php … → all yes
• vendor/bin/phpunit --filter SoapExtensionPolicyTest → OK
• vendor/bin/phpunit --filter extension_loaded_soap_phantom → OK (2)
• php script/bootstrap-inventory.php --check → OK 6518/6518

Verification transcript

=== ZEND ===
ext=no SoapClient=no SoapServer=no SoapFault=no is_soap_fault=no
=== VM default ===
ext=no SoapClient=no SoapServer=no SoapFault=no is_soap_fault=no
=== VM PROFILE=8.4 ===
ext=yes SoapClient=yes SoapServer=yes SoapFault=yes is_soap_fault=yes
=== UNIT ===
OK (1 test, 7 assertions)
=== COMPLIANCE phantom ===
OK (2 tests, 2 assertions)
=== inventory ===
OK 6518/6518

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