feat: allow role updates to token using cli

[burnerlee]

This PR adds the following flag functionality to nomad acl token update to allow users to update token roles:

1. -role-id
2. role-name

Fixes: #18354

[pkazmierczak]

ah one more thing: could you update the documentation to include these new flags, too? https://github.com/hashicorp/nomad/blob/main/website/content/docs/commands/acl/token/update.mdx

[tgross]

Sorry, it looks like we had a PR in-flight for this which got abandoned, and I didn't notice that we had this open when I carried that PR. I'm going to close this in lieu of https://github.com/hashicorp/nomad/pull/18532. My apologies @burnerlee!

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