Fix JSON/YAML generation, fix sort if timestamp not available

Current situation

opentf-ctl run workflow allows for the --output option, but the first line, giving the workflow ID, is not JSON or YAML.

Also, if, for whatever reasons, on a recent orchestrator version, a workflow manifest has no creationTimestamp, an error occurs.

Finally, SonarQube complains while cherry-picking :/

Desired outcome

Address the above.