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

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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

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

@@ -138,6 +138,14 @@ trigger-omnibus-env:
     reports:
       dotenv: $BUILD_ENV
 
+trigger-omnibus-env-ce:
+  extends:
+    - trigger-omnibus-env
+    - .rules:omnibus-build-ce
+  needs:
+    - pipeline: $PARENT_PIPELINE_ID
+      job: build-assets-image-ce
+
 trigger-omnibus:
   extends: .rules:omnibus-build
   stage: .pre
@@ -169,6 +177,13 @@ trigger-omnibus:
     project: gitlab-org/build/omnibus-gitlab-mirror
     strategy: depend
 
+trigger-omnibus-ce:
+  extends:
+    - trigger-omnibus
+    - .rules:omnibus-build-ce
+  needs:
+    - trigger-omnibus-env-ce
+
 download-knapsack-report:
   extends:
     - .gitlab-qa-image