Partial Revert of Issue #2976480: Do not send Cache-Tags header if Cache-control: no-cache.

    // Only set any headers when this is a cacheable response.

    $response = $event->getResponse();

    // Cache tags should be injected only when the response is cacheable. It is

    // cacheable when dynamic_page_cache module (if enabled) says so.

    // Alternatively, if dynamic_page_cache module is uninstalled, then we

    // fallback on testing that at least 'no-cache' cache directive is not

    // present in the response headers.

    $cacheTagsNeeded = $response instanceof CacheableResponseInterface;

    if ($response->headers->has('X-Drupal-Dynamic-Cache')) {

      $cacheTagsNeeded = $cacheTagsNeeded && $response->headers->get('X-Drupal-Dynamic-Cache') !== 'UNCACHEABLE';

    }

    $cacheTagsNeeded = $cacheTagsNeeded && !$response->headers->hasCacheControlDirective('no-cache');

    if ($cacheTagsNeeded) {

    if ($response instanceof CacheableResponseInterface

      && !$response->headers->hasCacheControlDirective('no-cache')) {

      // Iterate all tagsheader plugins and add a header for each plugin.

      $tags = $response->getCacheableMetadata()->getCacheTags();