Allow new expressions in class constant initializers (#10198)

[PurHur]

Summary

• Enable PHP 8.3+ new expressions in class constant initializers by removing the stale compile-time rejection in NewWithoutParensCompileCheck (static property new defaults remain forbidden).
• Flip CompilerVersion::supportsClassConstObjectExpressions() to true on 8.3+ target; existing VM/JIT materialization path (finalizePendingNewClassConst, ClassConstMaterializer) handles runtime object constants with shared identity.
• Update compliance/unit tests from expect-255 to php-src-strict success guards.

php-src reference

• Zend/zend_compile.c — zend_compile_const_expr(), ZEND_AST_NEW in constant context (PHP 8.3+)
• Zend/zend_constants.c — object-typed class constants

Verification

Issue repro:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/maintainer_gap_new_in_constant.php'

int(1)

Object identity:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php -r "
class C { public function __construct(public int \$n = 0) {} }
class Holder { public const X = new C(1); }
var_dump(Holder::X->n);
echo Holder::X === Holder::X ? \"same\\n\" : \"diff\\n\";
"'

int(1)
same

PHPUnit:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./vendor/bin/phpunit test/compliance/VMTest.php --filter "class_const_new|class_const_object|const_expr_new|new_in_constant"'
# OK (9 tests)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./vendor/bin/phpunit test/compliance/JITTest.php --filter "class_const_object"'
# OK (2 tests)

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && ./vendor/bin/phpunit --filter "NewWithoutParensCompileCheckTest|CompilerVersionGateTest|ClassConstObject"'
# OK (16 tests)

Closes #10198

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