Publish test images in a multiarch manifest

[Davo911]

What this PR does / why we need it:
The test images weren't pushed correctly, so I'd basically just push them in the same manner as the operators.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #3688

Special notes for your reviewer:

Release note:

NONE

[kubevirt-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[coveralls]

coverage: 59.062% (-0.01%) from 59.076%
when pulling 9a9219d on Davo911:test-image-multiarch-manifest
into 4c3dc65 on kubevirt:main.

[kubevirt-bot]

@Davo911: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-containerized-data-importer-e2e-destructive	9a9219d	link	true	/test pull-containerized-data-importer-e2e-destructive
pull-containerized-data-importer-e2e-nfs	9a9219d	link	true	/test pull-containerized-data-importer-e2e-nfs
pull-containerized-data-importer-non-csi-hpp	9a9219d	link	true	/test pull-containerized-data-importer-non-csi-hpp
pull-containerized-data-importer-e2e-hpp-latest	9a9219d	link	true	/test pull-containerized-data-importer-e2e-hpp-latest
pull-containerized-data-importer-e2e-upg	9a9219d	link	true	/test pull-containerized-data-importer-e2e-upg
pull-containerized-data-importer-e2e-istio	9a9219d	link	true	/test pull-containerized-data-importer-e2e-istio
pull-containerized-data-importer-e2e-hpp-previous	9a9219d	link	true	/test pull-containerized-data-importer-e2e-hpp-previous
pull-containerized-data-importer-e2e-ceph	9a9219d	link	true	/test pull-containerized-data-importer-e2e-ceph
pull-containerized-data-importer-e2e-ceph-wffc	9a9219d	link	true	/test pull-containerized-data-importer-e2e-ceph-wffc

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