test: remove phpstan ignoreErrors entries for things that are not errors

phpstan.neon

@@ -7,27 +7,3 @@ parameters:
       message: '#File ends with a trailing whitespace. This may cause problems when running the code in the web browser. Remove the closing \?\> mark or remove the whitespace.#'
       path:  src/Resources/views/partials/error.php
       count: 1
-    -
-      message: '#Undefined variable: \$OC_Version$#'
-      path: src/Command/ExecuteCoreUpgradeScriptsCommand.php
-      count: 1
-    -
-      message: '#Undefined variable: \$OC_VersionCanBeUpgradedFrom$#'
-      path: src/Command/ExecuteCoreUpgradeScriptsCommand.php
-      count: 1
-    -
-      message: '#Undefined variable: \$CONFIG$#'
-      path: src/Utils/Locator.php
-      count: 2
-    -
-      message: '#Undefined variable: \$OC_Version$#'
-      path: src/Utils/Locator.php
-      count: 1
-    -
-      message: '#Undefined variable: \$OC_Channel$#'
-      path: src/Utils/Locator.php
-      count: 1
-    -
-      message: '#Undefined variable: \$OC_Build$#'
-      path: src/Utils/Locator.php
-      count: 1