Backport of core: emit node evals only for sys jobs in dc into release/1.3.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #12955 to be assessed for backporting due to the inclusion of the label backport/1.3.x.

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

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Whenever a node joins the cluster, either for the first time or after
being down, we emit a evaluation for every system job to ensure all
applicable system jobs are running on the node.

This patch adds an optimization to skip creating evaluations for system
jobs not in the current node's DC. While the scheduler performs the same
feasability check, skipping the creation of the evaluation altogether
saves disk, network, and memory.

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