change metadata key from `finetuned_from` to `base_model` #4956

Job	Run time
build-windows (3.8)	14m 23s
build-ubuntu (3.8, Repository only)	1m 40s
build-ubuntu (3.8, Everything else)	6m 58s
build-ubuntu (3.8, torch)	3m 46s
build-ubuntu (3.11, Repository only)	2m 18s
build-ubuntu (3.11, Everything else)	5m 44s
build-ubuntu (3.11, torch)	2m 54s
build-ubuntu (3.11, lfs)	1m 16s
build-ubuntu (3.8, fastai)	3m 55s
build-ubuntu (3.10, fastai)	3m 34s
build-ubuntu (3.8, tensorflow)	1m 58s
build-ubuntu (3.10, tensorflow)	2m 19s
	50m 45s

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