Stdlib: array_key_exists() TypeError for non-array second argument (#4722)

[PurHur]

Summary

• Replace LogicException with Zend-matching TypeError when array_key_exists() receives a non-array second argument (VM via VmArray::requireArrayParam, JIT/AOT via JitArrayElem / TypeErrorRaise).
• Report object class names (not generic object) in VmArray::valueTypeLabel() for php-src parity on array param errors.

php-src reference: ext/standard/array.c — PHP_FUNCTION(array_key_exists) / Z_PARAM_ARRAY

Closes #4722

Verification

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

Output (Zend + VM match):

TypeError: array_key_exists(): Argument #2 ($array) must be of type array, C given
TypeError: array_key_exists(): Argument #2 ($array) must be of type array, C given

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit --filter array_key_exists_non_array'

OK (3 tests, 7 assertions)

AOT lint + abort on non-array string operand:

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/compile.php -l test/repro-maintainer/array_key_exists_non_array.php'
# exit 0

OUT=$(mktemp) && php bin/compile.php -o "$OUT" test/fixtures/aot/cases/array_key_exists_non_array.phpt
# AotTest: exit 134 (TypeError abort) — OK

Test plan

• Issue repro on VM matches Zend TypeError class + message
• Compliance PHPT array_key_exists_non_array.phpt
• AOT fixture array_key_exists_non_array.phpt (exit 134)
• Existing VM array_key_exists* tests green (5/5)

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