Since Python 3.3, mock is part of unittest in the standard library. The third-party `mock` library is a backport for older Python versions. python-mock is not included in CentOS Stream 9.
This bugzilla is included in oVirt 4.5.0 release, published on April 20th 2022. Since the problem described in this bug report should be resolved in oVirt 4.5.0 release, it has been closed with a resolution of CURRENT RELEASE. If the solution does not work for you, please open a new bug report.