Backport of docs: update Nomad 1.14 upgrade note to detail additonal info. into release/1.14.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #16071 to be assessed for backporting due to the inclusion of the label type/docs-cherrypick.

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

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This is a duplicate of #15538, because I don't have access to approve the Vercel deployment directly.

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See https://github.com/hashicorp/nomad/issues/15266 and https://github.com/hashicorp/nomad/issues/15360 for details.

We plan to submit a followup PR to update these docs once Nomad releases all fixes. At that point Nomad users will still need to be informed that they must upgrade Nomad to a compatible version before upgrading Consul to 1.14.

Feel free to edit the wording or formatting or whatever.

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Overview of commits

• fb8b4cf020a910c0a948c491d2ba7091052a5c48 - 4244ba3880168c7a604ff30876dd89a85c2e4d19 - 85d18f86f64b71f2befb91b1e275b1d88d9bf40c - d22c906cb8605acc0b52b82cc05e543ac4867de7

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