[k8s] Add k8s node allocatable metrics #10014

Job	Run time
markdownlint	16s
yamllint	10s
markdown-toc-check	40s
markdown-link-check	1m 47s
misspell	17s
semantic-conventions	10s
areas-dropdown-check	8s
policies-check	8s
semantic-conventions-registry	5s
polices-test	6s
schemas-check	20s
	4m 7s

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