Remove pipeline-common pipeline template inclusion form "gitlab-org/gitlab" pipeline

pipeline-common has been included in gitlab-org/gitlab pipeline historically mostly for omnibus related component reusability.

Now that gitlab-org/gitlab does not rely on gitlab-qa orchestrator and in most cases does not require most of the reusable components, it should be removed to simplify setup and reduce potential subtle bugs when variables from pipeline-common which can often contain outdated values are used instead of variables from gitlab-org/gitlab project.

One such issue example is incorrect ruby version usage: Use correct RUBY_VERSION in all e2e child pipel... (gitlab-org/gitlab!182280 - merged)