Switch off abi checker as it keeps failing

gocd/abichecker.gocd.yaml

@@ -1,20 +0,0 @@
-format_version: 3
-pipelines:
-  SUSE.Abichecker:
-    group: SLE.Checkers
-    lock_behavior: unlockWhenFinished
-    environment_variables:
-      OSC_CONFIG: /home/go/config/oscrc-abichecker
-    materials:
-      script:
-        git: https://github.com/openSUSE/openSUSE-release-tools.git
-    timer:
-      spec: 0 */15 * ? * *
-      only_on_changes: false
-    stages:
-    - Run:
-        approval: manual
-        resources:
-        - repo-checker
-        tasks:
-        - script: ./abichecker/abichecker.py --no-review --verbose -A https://api.suse.de --web-url=http://abichecker.suse.de project SUSE:Maintenance maintenance_incident