TASK: Remove no longer used .scrutinizer.yml

* As we don't use Scrutinizer any longer, but our own CI on gitlab.

.scrutinizer.yml

-build:
-  tests:
-    before:
-      - make install
-  environment:
-    php:
-      version: 5.6
-      ini:
-        'date.timezone': 'Europe/Berlin'
-
-filter:
-  excluded_paths:
-    - "tests/Fixtures/"