Static check fixes

Author: lbajsarowicz

app/code/Magento/Cms/Block/BlockByIdentifier.php

@@ -22,7 +22,7 @@
  */
 class BlockByIdentifier extends AbstractBlock implements IdentityInterface
 {
-    const CACHE_KEY_PREFIX = 'CMS_BLOCK';
+    public const CACHE_KEY_PREFIX = 'CMS_BLOCK';
 
     /**
      * @var GetBlockByIdentifierInterface

app/code/Magento/Cms/Test/Unit/Block/BlockByIdentifierTest.php

@@ -203,18 +203,6 @@ private function getPassthroughFilterMock(): Template
         return $filterMock;
     }
 
-    /**
-     * Returns stub of Identity based on `$identifier` and `$storeId`
-     *
-     * @param string $identifier
-     * @param int $storeId
-     * @return string
-     */
-    private function getIdentityStubByIdentifier(string $identifier, int $storeId = self::STUB_DEFAULT_STORE): string
-    {
-        return BlockByIdentifier::CACHE_KEY_PREFIX . '_' . $identifier . '_' . $storeId;
-    }
-
     /**
      * Returns stub of Identity based on `$cmsBlockId`
      *