Backport of fingerprint: add fingerprinting for CNI plugin versions into release/1.2.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #15452 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

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

---

This PR adds a fingerprinter to set the attribute
"plugins.cni.version.<name>" -> version of the CNI plugin if present at $client.cni_path

First half of #14022
Second half will be adding an implicit constraint on applicable jobs.

e.g.

➜ nomad node status -self -verbose | grep plugins.cni.version
plugins.cni.version.bandwidth   = v1.0.0
plugins.cni.version.bridge      = v1.0.0
plugins.cni.version.custom      = v1.0.3
plugins.cni.version.dhcp        = v1.0.0
plugins.cni.version.firewall    = v1.0.0
plugins.cni.version.host-device = v1.0.0
plugins.cni.version.host-local  = v1.0.0
plugins.cni.version.ipvlan      = v1.0.0
plugins.cni.version.loopback    = v1.0.0
plugins.cni.version.macvlan     = v1.0.0
plugins.cni.version.portmap     = v1.0.0
plugins.cni.version.ptp         = v1.0.0
plugins.cni.version.sbr         = v1.0.0
plugins.cni.version.static      = v1.0.0
plugins.cni.version.tuning      = v1.0.0
plugins.cni.version.vlan        = v1.0.0
plugins.cni.version.vrf         = v1.0.0

Targets 1.5.0

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