chore: restore integration tests #3669

Job	Run time
Build	3m 11s
Test example js-libp2p-example-browser-pubsub	2m 5s
Test example js-libp2p-example-chat	54s
Test example js-libp2p-example-circuit-relay	59s
Test example js-libp2p-example-connection-encryption	56s
Test example js-libp2p-example-custom-protocols	1m 20s
Test example js-libp2p-example-delegated-routing	1m 58s
Test example js-libp2p-example-discovery-mechanisms	1m 1s
Test example js-libp2p-example-peer-and-content-routing	1m 24s
Test example js-libp2p-example-pnet	1m 13s
Test example js-libp2p-example-protocol-and-stream-muxing	1m 18s
Test example js-libp2p-example-pubsub	1m 12s
Test example js-libp2p-example-transports	1m 7s
Test example js-libp2p-example-webrtc-private-to-private	2m 4s
	20m 42s

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