Passing NULL to the limit argument of preg_split triggers a deprecation in PHP 8.1

We use both 0 and -1 to mean limitless in core code. Going with -1 here since it is the default value and feels better to me to mean without limit.

As stated in #2 I believe that choice made in #3238941: \Drupal\big_pipe\Render\BigPipe::splitHtmlOnPlaceholders() causes deprecation errors on PHP 8.1 was wrong - but core already has plenty of examples of both 0 and -1.

Also #3238941: \Drupal\big_pipe\Render\BigPipe::splitHtmlOnPlaceholders() causes deprecation errors on PHP 8.1 should have included these fixes and a check of what default core was already using.

Here is the result of grep -ER "preg_split.*(0|-1)" ./core

./core/scripts/transliteration_data.php.txt:      foreach (preg_split('//u', $result, 0, PREG_SPLIT_NO_EMPTY) as $character) {
./core/lib/Drupal/Core/Mail/MailFormatHelper.php:    $split = preg_split('/<([^>]+?)>/', $string, -1, PREG_SPLIT_DELIM_CAPTURE);
./core/lib/Drupal/Component/Transliteration/PhpTransliteration.php:    foreach (preg_split('//u', $string, 0, PREG_SPLIT_NO_EMPTY) as $character) {
./core/lib/Drupal/Component/Transliteration/PhpTransliteration.php:    foreach (preg_split('//u', $string, 0, PREG_SPLIT_NO_EMPTY) as $character) {
./core/modules/locale/locale.module:  return implode('', preg_split('~(?<!\\\\)[\'"]\s*\+\s*[\'"]~s', substr($string, 1, -1)));
./core/modules/color/color.module:  $style = preg_split('/(#[0-9a-f]{6}|#[0-9a-f]{3})/i', $style, -1, PREG_SPLIT_DELIM_CAPTURE);
./core/modules/aggregator/aggregator.module:  return preg_split('/\s+|<|>/', \Drupal::config('aggregator.settings')->get('items.allowed_html'), -1, PREG_SPLIT_NO_EMPTY);
./core/modules/big_pipe/src/Render/BigPipe.php:      $result = preg_split($pattern, $html_string, 0, $flags);
./core/modules/search/src/SearchIndex.php:    $split = preg_split('/\s*<([^>]+?)>\s*/', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
./core/modules/search/src/SearchQuery.php:      $words = $phrase ? [$words] : preg_split('/ /', $words, -1, PREG_SPLIT_NO_EMPTY);
./core/modules/filter/filter.module:    $chunks = preg_split('/(<.+?>)/is', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
./core/modules/filter/filter.module:  $chunks = preg_split('@(<!--.*?-->|</?(?:pre|script|style|object|iframe|drupal-media|!--)[^>]*>)@i', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
./core/modules/filter/src/Plugin/Filter/FilterHtml.php:        $attribute_values = preg_split('/\s+/', $attribute->value, -1, PREG_SPLIT_NO_EMPTY);
./core/modules/filter/src/Plugin/Filter/FilterHtml.php:          $allowed_attribute_values = preg_split('/\s+/', str_replace($star_protector, '*', $attribute->value), -1, PREG_SPLIT_NO_EMPTY);
./core/modules/views/src/Plugin/views/filter/StringFilter.php:      $words = $phrase ? [$words] : preg_split('/ /', $words, -1, PREG_SPLIT_NO_EMPTY);

There are 4 zeros and 10 instances of -1 ...