Stdlib: number_format() array TypeError compliance guard (#4163)

[PurHur]

Summary

• Closes Stdlib: number_format() — TypeError when $num is not int/float (ext/standard/number_format.c parity) #4163 — number_format(['x']) already throws TypeError on VM/JIT via VmNumberFormat::coerceFloat(); this PR adds the missing compliance guard so the fix cannot regress.
• Adds VM + JIT .phpt tests matching Zend message: number_format(): Argument #1 ($num) must be of type float, array given.

Root cause

Behavior was implemented in ext/standard/VmNumberFormat.php (coerceFloat() default branch via VmParseStr::zendTypeLabel()); issue stayed open without a named PHPUnit/compliance filter.

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php -r "try { number_format([\"x\"]); } catch (Throwable \$e) { echo get_class(\$e),\": \",\$e->getMessage(),PHP_EOL; }"
php bin/vm.php -r "try { number_format([\"x\"]); } catch (Throwable \$e) { echo get_class(\$e),\": \",\$e->getMessage(),PHP_EOL; }"
php bin/jit.php -r "try { number_format([\"x\"]); } catch (Throwable \$e) { echo get_class(\$e),\": \",\$e->getMessage(),PHP_EOL; }"
'

TypeError: number_format(): Argument #1 ($num) must be of type float, array given
TypeError: number_format(): Argument #1 ($num) must be of type float, array given
TypeError: number_format(): Argument #1 ($num) must be of type float, array given

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

OK (4 tests, 4 assertions)

Closes #4163

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