Warnings and deprecations get converted to uncatchable ErrorExceptions

[brendt]

So for warnings and deprecations, we convert them to ErrorException:

        ini_set('display_errors', 'Off'); // @mago-expect lint:no-ini-set
        set_exception_handler($handler->handle(...));
        set_error_handler(function (int $code, string $message, string $filename, int $line) use ($handler): bool {
            $handler->handle(new ErrorException(
                message: $message,
                code: $code,
                filename: $filename,
                line: $line,
            ));

            return true;
        });

So they get reported by the error handler. However, these exceptions aren't actually thrown, so it's super confusion to get a exception page, but then not being able to catch it.