MGMT-20022: Handle missing ManagedCluster in non MCE environments #7348

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Red Hat Konflux/assisted-service-rhel9-acm-ds-main-on-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	6 seconds	init
✅ Succeeded	23 seconds	clone-repository
✅ Succeeded	2 minutes	prefetch-dependencies
✅ Succeeded	5 minutes	build-images
✅ Succeeded	14 seconds	build-image-index
✅ Succeeded	1 minute	build-source-image
✅ Succeeded	12 seconds	push-dockerfile
✅ Succeeded	6 seconds	deprecated-base-image-check
✅ Succeeded	2 minutes	clamav-scan
✅ Succeeded	15 seconds	rpms-signature-scan
✅ Succeeded	35 seconds	clair-scan
✅ Succeeded	14 seconds	apply-tags
✅ Succeeded	1 minute	sast-snyk-check
✅ Succeeded	57 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	7 seconds	show-sbom