LCORE-607: Info about PR sizes in Contributing guide #1485

Namespace: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/lightspeed-core-tenant" rel="nofollow">lightspeed-core-tenant
PipelineRun: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/lightspeed-core-tenant/pipelinerun/lightspeed-stack-on-pull-request-9rtkt" rel="nofollow">lightspeed-stack-on-pull-request-9rtkt

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Konflux kflux-prd-rh02/lightspeed-stack-on-pull-request has successfully validated your commit.

Status	Duration	Name
🟢 Succeeded	4 seconds	init
🟢 Succeeded	12 seconds	clone-repository
🟢 Succeeded	4 minutes	prefetch-dependencies
🟢 Succeeded	37 minutes	build-images
🟢 Succeeded	36 minutes	build-images
🟢 Succeeded	28 seconds	build-image-index
🟢 Succeeded	8 seconds	apply-tags
🟢 Succeeded	5 minutes	build-source-image
🟢 Succeeded	2 minutes	clair-scan
🟢 Succeeded	2 minutes	clair-scan
🟢 Succeeded	6 minutes	clamav-scan
🟢 Succeeded	3 minutes	clamav-scan
🟢 Succeeded	55 seconds	coverity-availability-check
🟢 Succeeded	1 minute	deprecated-base-image-check
🟢 Succeeded	13 minutes	ecosystem-cert-preflight-checks
🟢 Succeeded	13 minutes	ecosystem-cert-preflight-checks
🟢 Succeeded	6 minutes	rpms-signature-scan
🟢 Succeeded	1 minute	sast-shell-check
🟢 Succeeded	1 minute	sast-snyk-check
🟢 Succeeded	1 minute	sast-unicode-check
🟢 Succeeded	6 seconds	push-dockerfile
🟢 Succeeded	33 minutes	sast-coverity-check