MGMT-19381: Change downstream base images to rhel9.4 instead of ubi9 #883

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Red Hat Konflux/assisted-installer-agent-downstream-main-on-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	6 seconds	init
✅ Succeeded	17 seconds	clone-repository
✅ Succeeded	10 seconds	prefetch-dependencies
✅ Succeeded	3 minutes	build-images
✅ Succeeded	12 seconds	build-image-index
✅ Succeeded	29 seconds	clair-scan
✅ Succeeded	11 seconds	deprecated-base-image-check
✅ Succeeded	10 seconds	coverity-availability-check
✅ Succeeded	12 seconds	rpms-signature-scan
✅ Succeeded	9 seconds	push-dockerfile
✅ Succeeded	1 minute	clamav-scan
✅ Succeeded	12 seconds	sast-unicode-check
✅ Succeeded	30 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	16 seconds	sast-snyk-check
✅ Succeeded	7 seconds	apply-tags
✅ Succeeded	11 seconds	sast-shell-check
✅ Succeeded	6 seconds	show-sbom