Remove unused check-sahara-extra-artifacts

We use gate-sahara-extra-artifacts instead of the check job,
remove unused entry.

Change-Id: I90af7f802e2b852ecae7b454a051170342743804

jenkins/jobs/sahara.yaml

@@ -106,25 +106,6 @@
               copy-after-failure: false
 
 
-- job:
-    name: 'check-sahara-extra-artifacts'
-    node: bare-trusty
-
-    wrappers:
-      - build-timeout:
-          timeout: 65
-      - timestamps
-
-    builders:
-      - link-logs
-      - net-info
-      - gerrit-git-prep
-      - sahara-extra-build
-
-    publishers:
-      - console-log
-
-
 - job:
     name: 'gate-sahara-extra-artifacts'
     node: bare-trusty