Add e2e conformance test for R5 and for the latest version of the code
Created by: matofeder
This PR adds:
- A daily end-to-end conformance job running within the release/v6.0.0 branch of the R5 codebase.
- A daily end-to-end conformance job running within the latest codebase's main branch.
- Badges in README that will show the last build status of the above jobs
Note: The R5 badge will be available tomorrow at ~8 AM CEST - after this PR will be merged Note2: /tested using dev instance of Zuul
EDIT: This PR has been modified as the further tests show that it is not needed to define additional "daily" Zuul jobs, but it is enough to parameterize the current conformance job