Release payload creation should catch trivial YAML/JSON errors

[smarterclayton]

Would have prevented merge of the JSON/YAML error that broke

openshift/installer#422 (comment)

[smarterclayton]

@abhinavdahiya @wking this will block new CVO payloads from being created that don't have valid manifest files

[crawford]

/lgtm

[smarterclayton]

/retest

[openshift-ci-robot]

New changes are detected. LGTM label has been removed.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: crawford, smarterclayton

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[smarterclayton]

Merging to minimize regressions across teams this week.

Cluster up is being investigated by master team.

[openshift-ci-robot]

@smarterclayton: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/extended_clusterup	114c597	link	/test extended_clusterup
ci/prow/e2e-gcp	114c597	link	/test e2e-gcp

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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