Add nomad node pool support

[fairglen]

What's New: Since Nomad 1.6 now we can separate our default vs non-default workloads with node pools. This means job authors don’t have to repeatedly add the same constraints to every job just to avoid certain nodes.

This PR adds the role variable nomad_node_pool that if present gets settled on the client config.

[CodiumAI-Agent]

PR Analysis

• 🎯 Main theme: Adding support for Nomad node pools

• 📌 Type of PR: Enhancement

• 🧪 Relevant tests added: No

• ✨ Focused PR: Yes, the PR has a clear and coherent title and description, and all PR code diff changes are properly derived from the title and description.

• 🔒 Security concerns: No, this PR does not introduce any obvious security concerns. It's a configuration enhancement and doesn't involve any sensitive data handling or risky operations.

  PR Feedback

• 💡 General PR suggestions: The PR is well-structured and the changes are clearly explained in the description. However, it would be beneficial to add tests to verify the new functionality. Also, it would be helpful to provide an example of how to use the new nomad_node_pool variable in the README.

How to use

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[CodiumAI-Agent]

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