All these jobs are redundant and a waste of resources:
- the containers have already been built & pushed in the merge pipeline
- the mesa build variants have already all passed
- the driver tests have already all passed
None of these jobs are doing anything useful in this pipeline, but it
costs a factor of 2x to our infrastructure, so let's remove them.
In other words, the only job left in the post-merge pipeline is the
`pages` job that deploys the update to the website.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26451>
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