Add ability to set initial health check status

[rsyabuta]

New checks are initially set to "critical" when registered in consul. It would be nice to have the ability to initially set them to "passing" for certain job types as noted in the consul docs: https://www.consul.io/docs/agent/checks.html.

[justinwalz]

We've also noticed this with the Nomad Client HTTP Check as clients come online. This ends up triggering alarms based on the failed consul status. Would it be possible to 1) have nomad wait to register itself once healthy or 2) initially set itself as passing (as described above)?

[dadgar]

This is available in newer releases: https://www.nomadproject.io/docs/job-specification/service.html#initial_status

[github-actions]

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