PHPStan: exclude *all* test files

The `/tests` directory was already excluded, but the _sniff_ test directories were not and what with a different PHPUnit version being used and PHPStan - apparently - struggling to understand the inheritance, let's just exclude the rest of the test files as well until such time as the PHPStan setup is made compatible with the tests.

Author: jrfnl

phpstan.neon.dist

@@ -6,6 +6,14 @@ parameters:
     paths:
         - requirements.php
         - src
+    excludePaths:
+        - src/Standards/Generic/Tests/*
+        - src/Standards/PEAR/Tests/*
+        - src/Standards/PSR1/Tests/*
+        - src/Standards/PSR2/Tests/*
+        - src/Standards/PSR12/Tests/*
+        - src/Standards/Squiz/Tests/*
+        - src/Standards/Zend/Tests/*
     bootstrapFiles:
         - tests/bootstrap.php