Backport of cli: update nomad job init full examples into stable-website

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #24232 to be assessed for backporting due to the inclusion of the label backport/website.

The below text is copied from the body of the original PR.

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The full example jobspecs emitted by nomad job init and nomad job init -connect have not seen any improvement in over a year. I intended to just peek in, add a new ui{} block block, and be done. However, something about skimming over the phrase the online documentation a dozen times made me stop and do some spring cleaning.

The diff is an absolute nightmare even though I think my changes are fairly minor. Some highlights:

1. Added a ui block because I think it should be a widely used feature!
2. Removed tons of non-connect-related blocks from the connect example. I don't think the value of documenting blocks twice in the normal example and in connect is worth it. We could add some templating to keep those blocks in sync, but I just don't think repeating our examples is helpful. When people want a service mesh example, they probably want to see exactly what's relevant to the service mesh, not a bunch of unrelated topics like affinity{}.
3. Removed the online documentation. It is 2024, not 1999. I think our users know what a URL implies.
4. Cleaned up whitespace in a few places although I did remove some comments to do it. For example I couldn't figure out how best to indent affinity{} and all of its field comments, so I just removed the field comments. I think users are much better off visiting the online documentation for those details. The examples should demonstrate Nomad's featureset, not be a comprehensive guide to those features.

Pinging @philrenaud because I've been pestering Phil with ui{} things already, and @aimeeu because despite this being a part of the nomad binary, I think it's documentation, and I want to make sure my changes fit with the style of similar examples our docs are full of. Let me know if you want to hand it off.

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Overview of commits

• e440e1d

[schmichael]

No website related changes.