RHOAIENG-18401, RHOAIENG-18402: chore(.tekton/, .github/renovate.json): configure Konflux build and Renovate #514

Namespace: <a href="https://detailurl.setting.custom-console-url-namespace.is.not.configured" rel="nofollow">rhoai-ide-konflux-tenant
PipelineRun: <a href="https://console.redhat.com/application-pipeline/ns/rhoai-ide-konflux-tenant/pipelinerun/kf-notebook-controller-on-pull-request-d2hrd" rel="nofollow">kf-notebook-controller-on-pull-request-d2hrd

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Status	Duration	Name
✅ Succeeded	6 seconds	init
✅ Succeeded	8 seconds	clone-repository
✅ Succeeded	7 seconds	prefetch-dependencies
✅ Succeeded	2 minutes	build-container
✅ Succeeded	7 seconds	build-image-index
✅ Succeeded	42 seconds	deprecated-base-image-check
✅ Succeeded	7 seconds	apply-tags
✅ Succeeded	11 seconds	rpms-signature-scan
✅ Succeeded	19 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	39 seconds	sast-snyk-check
✅ Succeeded	37 seconds	sast-unicode-check
✅ Succeeded	36 seconds	coverity-availability-check
✅ Succeeded	48 seconds	clamav-scan
✅ Succeeded	1 minute	clair-scan
✅ Succeeded	21 seconds	push-dockerfile
✅ Succeeded	38 seconds	sast-shell-check
✅ Succeeded	7 seconds	show-sbom