cli: wait flag for use with deployment status -monitor

[jdockerty]

Addresses comments laid out in #11068

[hashicorp-cla]

All committers have signed the CLA.

[tgross]

Looks great @jdockerty!

To get this into mergeable state:

• Address the comments.
• Run make cl to add a changelog entry for the flag.
• Add the docs for the flag to the deployment status docs in status.mdx
• Mark it ready for review!

I think at some point someone is going to want to come along and add this feature to job run too, but looking at the code for that the monitoring is a bit more complex because we monitor an eval and then switch to monitoring the deployment. What you've got here does the job asked and is worth shipping on its own. 😀

[tgross]

LGTM! Thanks @jdockerty!

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