Remove including pipeline-common in e2e test pipelines

Remove unnecessary inherits

Remove .gitlab-qa-install extends

Remove qa-base reference

Update notify-slack job

Update the way variables are triggered

Set ruby version in pipeline creator

Extract omnibus e2e test base job

Extract common e2e test variables

Inherit omnibus cache related variables

Move definition to omnibus

Skip clone for release-set job

Use OS variables for omnibus qa job images