Stdlib: get_defined_functions(exclude_disabled:) on reference profile (#16902)

[PurHur]

Summary

• Fix regression from Stdlib: get_defined_functions() exclude_disabled filter (#4942) #16890: supportsGetDefinedFunctionsExcludeDisabled() was gated on PHP 8.4 get_declared_* exclude_deprecated, but Zend 8.2+ already exposes exclude_disabled on get_defined_functions().
• Gate on REFERENCE_PHP_VERSION >= 8.2 so BuiltinParamNames registers the named parameter on the default (no PHP_COMPILER_PROFILE) VM path.
• Add reference-profile maintainer repro beside the forward-profile repro.

Root cause

version_compare(languageProfileVersion(), '8.4.0', '>=') is false on the 8.4.0-dev reference profile, so named exclude_disabled: hit "Unknown named parameter" despite VM/JIT implementation already present (#16890).

php-src reference

ext/standard/basic_functions.c — PHP_FUNCTION(get_defined_functions) / $exclude_disabled

PHP implementation

• lib/CompilerVersion.php — supportsGetDefinedFunctionsExcludeDisabled()
• lib/BuiltinParamNames.php — existing exclude_disabled registration (unchanged)
• ext/standard/get_defined_functions_.php + VmReflection.php — existing handler (unchanged)

Verification

php bin/vm.php test/repro/maintainer_gap_get_defined_functions_exclude_disabled_reference.php
# ok

php bin/vm.php test/repro/maintainer_gap_get_defined_functions_exclude_disabled.php
# ok

source script/php-env.sh && vendor/bin/phpunit --filter 'get_defined_functions_exclude_disabled' test/compliance/VMTest.php
# OK (2 tests)

source script/php-env.sh && vendor/bin/phpunit --filter 'CompilerVersionGateTest::testSupportsGetDefinedFunctionsExcludeDisabled'
# OK (2 tests)

Closes #16902

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