Replace FileUploadHandler:: handleFileUpload() switch with match when core requires PHP 8

Problem/Motivation

Coming from #3232248-54: Move _file_save_upload_single to a service and deprecate →

Steps to reproduce

+++ b/core/modules/file/src/Upload/FileUploadHandler.php
@@ -0,0 +1,134 @@
+    switch ($uploadedFile->getError()) {
+      case \UPLOAD_ERR_INI_SIZE:
...
+      case \UPLOAD_ERR_FORM_SIZE:
...
+      case \UPLOAD_ERR_PARTIAL:
...
+      case \UPLOAD_ERR_NO_FILE:
...
+      case \UPLOAD_ERR_NO_TMP_DIR:
...
+      case \UPLOAD_ERR_CANT_WRITE:
...
+      case \UPLOAD_ERR_EXTENSION:
...
+    throw new FileException($uploadedFile->getErrorMessage());

Proposed resolution

Use https://www.php.net/manual/en/control-structures.match.php

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet