chore: restore integration tests #3668

Job	Run time
Build	3m 0s
Test example js-libp2p-example-browser-pubsub	2m 0s
Test example js-libp2p-example-chat	1m 27s
Test example js-libp2p-example-circuit-relay	1m 5s
Test example js-libp2p-example-connection-encryption	53s
Test example js-libp2p-example-custom-protocols	53s
Test example js-libp2p-example-delegated-routing	2m 35s
Test example js-libp2p-example-discovery-mechanisms	1m 6s
Test example js-libp2p-example-peer-and-content-routing	1m 44s
Test example js-libp2p-example-pnet	1m 17s
Test example js-libp2p-example-protocol-and-stream-muxing	56s
Test example js-libp2p-example-pubsub	1m 23s
Test example js-libp2p-example-transports	1m 12s
Test example js-libp2p-example-webrtc-private-to-private	2m 13s
	21m 44s

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