Fix is_callable() third $callable_name by-ref argument (#9505)

[PurHur]

Summary

• Register is_callable argument Stdlib: ceil, floor, intval and expanded PHPT specs #3 ($callable_name) in BuiltinByRefParams / BuiltinParamNames so the VM validates and binds by-ref correctly.
• Fix VmCallable::writeCallableName() — use resolveIndirect()->string() (the old Variable::isReference() call was undefined and fatal).
• Align php-src name population: write $callable_name even when the check returns false (e.g. unknown function still reports 'NoSuchFunction_xyz').
• Extend JitIsCallable to write the resolved name into the third argument under AOT/JIT.

php-src reference: ext/standard/basic_functions.c — PHP_FUNCTION(is_callable)

Verification

# VM repro (matches Zend PHP 8.2)
php bin/vm.php test/repro/maintainer_gap_is_callable_name_byref.php
# true 'strlen'
# false 'NoSuchFunction_xyz'

php test/repro/maintainer_gap_is_callable_name_byref.php
# same output

# Unit
./vendor/bin/phpunit test/unit/BuiltinByRefParamsTest.php --no-configuration
# OK (6 tests)

# AOT (Docker harness)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/compile.php /tmp/is_callable_aot.php -o /tmp/is_callable_aot && /tmp/is_callable_aot'
# true strlen

Closes #9505

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