[ISV-5787] Remove child digests from externalRefs #269

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PipelineRun: <a href="https://console.redhat.com/application-pipeline/ns/rhtap-build-tenant/pipelinerun/sbom-utility-scripts-on-pull-request-6xtft" rel="nofollow">sbom-utility-scripts-on-pull-request-6xtft

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Red Hat Konflux/sbom-utility-scripts-on-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	18 seconds	init
✅ Succeeded	46 seconds	clone-repository
✅ Succeeded	9 seconds	prefetch-dependencies
✅ Succeeded	2 minutes	build-images
✅ Succeeded	19 seconds	build-image-index
✅ Succeeded	3 minutes	clamav-scan
✅ Succeeded	12 seconds	coverity-availability-check
✅ Succeeded	11 seconds	push-dockerfile
✅ Succeeded	1 minute	clair-scan
✅ Succeeded	2 minutes	build-source-image
✅ Succeeded	7 seconds	deprecated-base-image-check
✅ Succeeded	16 seconds	rpms-signature-scan
✅ Succeeded	12 seconds	apply-tags
✅ Succeeded	21 seconds	sast-snyk-check
✅ Succeeded	17 seconds	sast-shell-check
✅ Succeeded	1 minute	ecosystem-cert-preflight-checks
✅ Succeeded	10 seconds	sast-unicode-check