Drop quay.io/olmtest

[perdasilva]

Description

Using quay.io/olmtest to store image fixtures has meant that we've had to automate the updating of these images when, e.g. operator-framework gets bumped.

There a few moving parts and potential for issues.

A better approach might be to do away with quay.io/olmtest in favor of a local registry and just rebuild the fixtures on every job.