build: Install dependencies only in Tox environments #3688

Job	Run time
test-all-runtimes	0s
lint (3.9)	53s
test-mlserver (ubuntu-22.04, 3.9, true)	16m 24s
lint (3.10)	48s
generate (3.9, dataplane)	37s
test-mlserver (ubuntu-22.04, 3.10, true)	17m 9s
generate (3.9, model-repository)	37s
test-runtimes (ubuntu-22.04, 3.9, sklearn, true)	2m 1s
generate (3.10, dataplane)	33s
test-runtimes (ubuntu-22.04, 3.9, xgboost, true)	3m 28s
generate (3.10, model-repository)	36s
test-runtimes (ubuntu-22.04, 3.9, lightgbm, true)	2m 12s
test-runtimes (ubuntu-22.04, 3.9, mlflow, true)	6m 11s
test-runtimes (ubuntu-22.04, 3.9, huggingface, true)	6m 14s
test-runtimes (ubuntu-22.04, 3.9, alibi-explain, true)	6m 18s
test-runtimes (ubuntu-22.04, 3.9, alibi-detect, true)	3m 59s
test-runtimes (ubuntu-22.04, 3.9, catboost, true)	2m 15s
test-runtimes (ubuntu-22.04, 3.10, sklearn, true)	2m 14s
test-runtimes (ubuntu-22.04, 3.10, xgboost, true)	2m 55s
test-runtimes (ubuntu-22.04, 3.10, lightgbm, true)	1m 47s
test-runtimes (ubuntu-22.04, 3.10, mlflow, true)	6m 38s
test-runtimes (ubuntu-22.04, 3.10, huggingface, true)	6m 39s
test-runtimes (ubuntu-22.04, 3.10, alibi-explain, true)	6m 3s
test-runtimes (ubuntu-22.04, 3.10, alibi-detect, true)	4m 16s
test-runtimes (ubuntu-22.04, 3.10, catboost, true)	2m 41s
	1h 43m 28s

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