chore: re-enable examples #3597

Job	Run time
Build	3m 16s
Test example js-libp2p-example-browser-pubsub	1m 48s
Test example js-libp2p-example-chat	1m 0s
Test example js-libp2p-example-circuit-relay	58s
Test example js-libp2p-example-connection-encryption	55s
Test example js-libp2p-example-custom-protocols	1m 0s
Test example js-libp2p-example-delegated-routing	2m 15s
Test example js-libp2p-example-discovery-mechanisms	1m 15s
Test example js-libp2p-example-peer-and-content-routing	1m 25s
Test example js-libp2p-example-pnet	51s
Test example js-libp2p-example-protocol-and-stream-muxing	1m 4s
Test example js-libp2p-example-pubsub	1m 5s
Test example js-libp2p-example-transports	1m 29s
Test example js-libp2p-example-webrtc-private-to-private	1m 55s
	20m 16s

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