Remove rpm-ostree tasks' OWNERS files #1717

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Status	Duration	Name
✅ Succeeded	15 seconds	fetch-repository
✅ Succeeded	9 minutes	build-appstudio-utils
✅ Succeeded	6 minutes	sast-snyk-check
✅ Succeeded	1 minute	task-switchboard
✅ Succeeded	1 minute	sast-unicode-check
✅ Succeeded	52 seconds	ec-task-checks
✅ Succeeded	1 minute	check-task-migration-md
✅ Succeeded	1 minute	task-lint-check
✅ Succeeded	5 minutes	build-bundles
✅ Succeeded	1 minute	check-task-pipeline-repo-existence