#25669: health_check.php fails if any database cache engine configured

- fixed wrong "@return description" of the remove method in class
  Magento\Framework\Cache\Backend\Database
- fixed wrong returned type of the method "unlock" in class
  Magento\Framework\Lock\Backend\Cache
- fixed health_check to create instances into block "check cache storage
  availability"

Author: andrewbess

lib/internal/Magento/Framework/Cache/Backend/Database.php

@@ -240,7 +240,7 @@ public function save($data, $id, $tags = [], $specificLifetime = false)
      * Remove a cache record
      *
      * @param  string $id Cache id
-     * @return boolean True if no problem
+     * @return int|boolean Number of affected rows or false on failure
      */
     public function remove($id)
     {

lib/internal/Magento/Framework/Lock/Backend/Cache.php

@@ -45,7 +45,7 @@ public function lock(string $name, int $timeout = -1): bool
      */
     public function unlock(string $name): bool
     {
-        return $this->cache->remove($this->getIdentifier($name));
+        return (bool)$this->cache->remove($this->getIdentifier($name));
     }
 
     /**

pub/health_check.php

@@ -63,8 +63,10 @@
         }
         $cacheBackendClass = $cacheConfig[ConfigOptionsListConstants::CONFIG_PATH_BACKEND];
         try {
+            /** @var \Magento\Framework\App\Cache\Frontend\Factory $cacheFrontendFactory */
+            $cacheFrontendFactory = $objectManager->get(Magento\Framework\App\Cache\Frontend\Factory::class);
             /** @var \Zend_Cache_Backend_Interface $backend */
-            $backend = new $cacheBackendClass($cacheConfig[ConfigOptionsListConstants::CONFIG_PATH_BACKEND_OPTIONS]);
+            $backend = $cacheFrontendFactory->create($cacheConfig);
             $backend->test('test_cache_id');
         } catch (\Exception $e) {
             http_response_code(500);