RHOAIENG-8299: Fix CentOS Stream 8 download location

[jiridanek]

Previously used location is now unavailable and returns 404 error. This is because CentOS Stream 8 has been EOLd

This new location is an archive and is no longer receiving updates.

(cherry picked from commit 8e19ee2)

[openshift-ci]

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[atheo89]

Hey! Since this PR is not specifically for downstream we don't need to open a separated PR for this only. This is going to be sync on Fridays sync PR when we will do the release. Check for example another sync PR #246

[jiridanek]

We don't create PRs by hand, @harshad16 will do this on Friday before code freeze.

There are three things that are downstream only, that have to be updated manually. These are: the RHEL-based RStudio, image streams, and one more thing.

[atheo89]

and manifests!