Add a log line to help track node eligibility

[Kellel]

Often when debugging issues with our nomad cluster we find that it can
be difficult to correlate manual and automated actions against the
cluster state as nodes are brought into and out of production.

This doesn't fix #8965, but it is something to help minimize the inconvenience in the meantime.

[hashicorp-cla]

All committers have signed the CLA.

[jrasell]

Hi @Kellel and thanks for raising this PR which seems very useful to cluster operators. I have suggested some changes for you to look over; the most notable change is to remove the use of .With from the logger. This function creates a sublogger with the given kv context always present which we do not need. We can just rely on the message kv formatting for this use case.

[Kellel]

Anything else needed here @jrasell ?

[jrasell]

Hi @Kellel thanks for this; I just added a changelog entry and will get this merged.

[github-actions]

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