Reject parse_str() one-argument form in all scopes (#4050)

[PurHur]

Summary

• parse_str() now requires exactly two arguments on VM and JIT, matching PHP 8+ / php-src ext/standard/basic_functions.c
• Removed the {main} one-arg import path (VmScope::requireMainScriptForParseStrOneArg, JitParseStr::parseIntoScope call site)
• Updated compliance PHPTs; dropped AOT one-arg fixture (native emitArgumentCountError still segfaults — VM/JIT compliance covers arity)

Closes #4050

php-src reference

ext/standard/basic_functions.c — PHP_FUNCTION(parse_str) arity check (PHP 8+)

PHP implementation

• ext/standard/parse_str.php — VM + JIT lowering
• ext/standard/VmScope.php — deleted main-script one-arg exception

C runtime shrink

No new C; removed VM scope helper for legacy one-arg import (52 lines net deleted across PHP paths).

Verification

# Issue repro
./script/docker-exec.sh -- bash -lc 'php bin/vm.php -r "try { parse_str(\"x=1\"); } catch (ArgumentCountError \$e) { echo \$e->getMessage(); }"'
# parse_str() expects exactly 2 arguments, 1 given

./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro-maintainer/parse_str_function_scope.php'
# parse_str() expects exactly 2 arguments, 1 given

# Targeted tests (15/15 OK)
./script/docker-exec.sh -- bash -lc 'cd /compiler && vendor/bin/phpunit --filter parse_str'
# OK (15 tests, 23 assertions)

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