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/main.gitlab-ci.yml

@@ -60,6 +60,8 @@ stages:
   needs:
     - job: trigger-omnibus
       optional: true
+    - job: trigger-omnibus-ce
+      optional: true
     - job: download-knapsack-report
       artifacts: true
       optional: true