Remove the unused variables

Kindly review patch.

-    $tokens = $this->coreToken->getInfo();
+    $this->coreToken->getInfo();

Token::getInfo() just returns information for a token. If that information is not necessary, it is not necessary to even call that method.

-          foreach ($entity->get($current_key) as $key => $value) {
-            foreach ($value->getValue() as $key_value => $value_value) {
+          foreach ($entity->get($current_key) as $value) {
+            foreach ($value->getValue() as $value_value) {

-
-    $display_field_config = $field['settings'];
-
+    
     // Check the currently selected plugin, and merge persisted values for its

Since this issue is focusing on removing unused variables, and those changes do not involve lines where unused variables are set, those changes are off-topic.
Also, for empty lines, it is not necessary to add heading spaces.

Thank you for the patch!

Since those are warnings/errors reported by PHP_CodeSniffer, it is preferable to create a single issue to resolve the warnings/errors reported by PHP_CodeSniffer. There is already 📌 Fix the issues reported by PHP_CodeSniffer Postponed , whose scope should be changed to be a broader issue, as described in that issue.