fix: use isPromise/etc function from utils #3918

Job	Run time
Build	2m 46s
Test example js-libp2p-example-browser-pubsub	2m 20s
Test example js-libp2p-example-chat	1m 35s
Test example js-libp2p-example-circuit-relay	1m 35s
Test example js-libp2p-example-connection-encryption	1m 4s
Test example js-libp2p-example-custom-protocols	1m 3s
Test example js-libp2p-example-delegated-routing	2m 15s
Test example js-libp2p-example-discovery-mechanisms	1m 27s
Test example js-libp2p-example-peer-and-content-routing	1m 5s
Test example js-libp2p-example-pnet	1m 1s
Test example js-libp2p-example-protocol-and-stream-muxing	1m 8s
Test example js-libp2p-example-pubsub	2m 25s
Test example js-libp2p-example-transports	1m 9s
Test example js-libp2p-example-webrtc-private-to-private	1m 46s
	22m 39s

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