Stdlib: array_udiff/uintersect enum case callbacks (#5637)

[PurHur]

Summary

• Remove rejectEnumCaseSetOpOperands guard from VmArrayUserSetOps — user-comparator array_udiff* / array_uintersect* / array_diff_u* / array_intersect_u* builtins must allow enum case values and pass them to compare callbacks (php-src ext/standard/array.c, unlike plain array_diff/array_intersect which reject enums per php-in-php: array_intersect() enum keys — delete C fast-path, VM Error parity from ext/standard/VmArray.php #5927).
• Add compliance PHPT and maintainer repro verifying enum case objects reach callbacks and array_udiff results preserve case identity.

php-src reference

• ext/standard/array.c — php_array_udiff, php_array_uintersect (user callback receives enum zvals)

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php test/repro-maintainer/parity_array_udiff_enum.php
php bin/vm.php test/repro-maintainer/parity_array_udiff_enum.php
php bin/jit.php test/repro-maintainer/parity_array_udiff_enum.php
vendor/bin/phpunit --filter array_udiff_enum
vendor/bin/phpunit --filter array_udiff_family
'

Output:

1
ok
true
1
ok
true
1
ok
true
OK (2 tests, 2 assertions)   # array_udiff_enum VM+JIT
OK (3 tests, 4 assertions) # array_udiff_family regression

Closes #5637

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