Harvest should handle lun and namespace metrics with simple names

[cgrinds]

No description provided.

[cgrinds]

Verified on 24.08.0 commit 0d2d7b4

go run cmd/poller/poller.go --config cbg/harvest.ved.yml --promPort 12990 --poller a

curl -s 'http://localhost:12990/metrics' | sort | rg -v '^#|metadata'

lun_avg_read_latency{cluster="stiA900-3111717670219",datacenter="rtp",lun="lun_linux10",svm="san_vs_2",volume=""} 0
lun_labels{cluster="stiA900-3111717670219",datacenter="rtp",lun="lun_windows18",node="stiA900-311",qtree="",state="online",svm="san_vs_2",volume="lun_windows18"} 1.0
namespace_size_available{cluster="stiA900-3111717670219",datacenter="rtp",path="active_tcp_ns_31",svm="san_vs_4",uuid="e4a2036b-5588-11ef-9d94-d039ea59432d",volume="active_tcp_ns_31"} 1073741824
namespace_labels{cluster="stiA900-3111717670219",datacenter="rtp",is_read_only="false",node="stiA900-312",nsid="00000002h",os_type="linux",path="active_tcp_ns_79",state="online",subsystem="san_vs_1_tcp_subsystem_5",svm="san_vs_1",uuid="33445880-5589-11ef-bffa-d039ea58f8ab",volume="active_tcp_ns_79"} 1.0