Add compliance tests for get_class() on enum cases (#5484)

[PurHur]

Summary

• Add VM, JIT, and AOT compliance coverage for get_class() on enum case operands (Stdlib: get_class() on enum case must return enum name not false (ext/standard/basic_functions.c) #5484).
• Behavior already matched php-src via ext/standard/get_class_.php (TYPE_ENUM_CASE branch) and JitGetClass; this PR locks parity with tests only.

php-src reference

• ext/standard/basic_functions.c — zif_get_class() enum branch
• Zend/zend_enum.c — enum object class name

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro/parity_get_class_enum.php
php bin/vm.php test/repro/parity_get_class_enum.php
php bin/jit.php test/repro/parity_get_class_enum.php
vendor/bin/phpunit --filter get_class_enum test/compliance/ test/aot/AotTest.php
'

Output:

string(1) "E"
string(1) "E"
string(6) "Status"
string(5) "Plain"
(... VM/JIT identical ...)
OK (5 tests, 5 assertions)

Closes #5484

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