Clarify ec task usage in this repo #902

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Red Hat Konflux/build-definitions-pull-request has successfully validated your commit.

Status	Duration	Name
✅ Succeeded	18 seconds	fetch-repository
✅ Succeeded	14 seconds	yaml-lint-check
✅ Succeeded	14 seconds	sast-snyk-check
✅ Succeeded	11 seconds	check-task-migration-md
✅ Succeeded	1 minute	ec-task-checks
✅ Succeeded	6 minutes	build-container
✅ Succeeded	2 minutes	check-partner-tasks
✅ Succeeded	2 minutes	build-bundles
✅ Succeeded	1 hour	e2e-tests
✅ Succeeded	2 minutes	check-task-pipeline-repo-existence
✅ Succeeded	9 seconds	e2e-cleanup