Add ability to run E2E tests against gitlab foss

What does this MR do and why?

Add ability to run E2E tests in gitlab CE mode

Closes #398206 (closed)

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.

.gitlab/ci/package-and-test/rules.gitlab-ci.yml

@@ -53,9 +53,7 @@
   rules:
     - if: $SKIP_OMNIBUS_TRIGGER == "true"
       when: never
-    - if: $FOSS_ONLY == "1"
-      when: never
-    - when: on_success
+    - if: $FOSS_ONLY != "1"
 
 .rules:omnibus-build-ce:
   rules: