refactor(RELEASE-1191): use simple-signing-pipeline for irs #723

Namespace: <a href="https://detailurl.setting.custom-console-url-namespace.is.not.configured" rel="nofollow">rhtap-release-2-tenant
PipelineRun: <a href="https://console.redhat.com/application-pipeline/ns/rhtap-release-2-tenant/pipelinerun/release-service-catalog-on-pull-request-fxpg8" rel="nofollow">release-service-catalog-on-pull-request-fxpg8

Success

Red Hat Konflux/release-service-catalog-on-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	1 minute	init
✅ Succeeded	1 minute	clone-repository
✅ Succeeded	38 seconds	build-container
✅ Succeeded	8 seconds	build-image-index
✅ Succeeded	22 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	32 seconds	sast-snyk-check
✅ Succeeded	13 seconds	rpms-signature-scan
✅ Succeeded	14 seconds	apply-tags
✅ Succeeded	1 minute	clamav-scan
✅ Succeeded	1 minute	push-dockerfile
✅ Succeeded	1 minute	clair-scan
✅ Succeeded	1 minute	deprecated-base-image-check
✅ Succeeded	22 seconds	show-sbom
✅ Succeeded	17 seconds	show-summary