fix: meta-reference parallel utils bug, use isinstance not equality #1

Job	Run time
test-matrix (agents, library)	4m 40s
test-matrix (inference, http)	6m 37s
test-matrix (agents, http)	4m 43s
test-matrix (inference, library)	5m 33s
test-matrix (inspect, library)	1m 53s
test-matrix (datasets, http)	1m 53s
test-matrix (datasets, library)	1m 37s
test-matrix (scoring, library)	1m 57s
test-matrix (post_training, http)	1m 45s
test-matrix (scoring, http)	2m 3s
test-matrix (providers, http)	1m 54s
test-matrix (post_training, library)	1m 36s
test-matrix (providers, library)	1m 48s
test-matrix (inspect, http)	2m 1s
	40m 0s

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