ci: remove ISPC from the Fedora CI image
Revert commit 5ece12b7e4 (gitlab-ci: add ISPC to the Fedora CI image,
2020-08-18, v3.19.0-rc1~244^2). Later we will download ISPC in specific
jobs.
Update a `RunCMake.NinjaMultiConfig` test expectation to account for
a change to the Qt deployed on Fedora 36.