Enable workspace testing in MRs by utilising the CNG instance

Currently the first e2e test of workspaces is performed in staging. Currently in every MR, the e2e tests are run against a CNG instance of gitlab which uses the GitLab Helm chart -> https://docs.gitlab.com/development/testing_guide/end_to_end/test_pipelines/#e2etest-on-cng

This test suite blocks MRs. We could extend the cng orchestration tool to configure workspaces and then execute the existing workspaces e2e test against it, this would give groupremote development engineers earlier feedback on Category:Workspaces changes.