chore: move transport interface tests to integration package #3675

Job	Run time
Build	3m 22s
Test example js-libp2p-example-browser-pubsub	1m 40s
Test example js-libp2p-example-chat	1m 17s
Test example js-libp2p-example-circuit-relay	54s
Test example js-libp2p-example-connection-encryption	59s
Test example js-libp2p-example-custom-protocols	1m 19s
Test example js-libp2p-example-delegated-routing	2m 6s
Test example js-libp2p-example-discovery-mechanisms	1m 0s
Test example js-libp2p-example-peer-and-content-routing	1m 9s
Test example js-libp2p-example-pnet	59s
Test example js-libp2p-example-protocol-and-stream-muxing	1m 8s
Test example js-libp2p-example-pubsub	1m 26s
Test example js-libp2p-example-transports	55s
Test example js-libp2p-example-webrtc-private-to-private	1m 51s
	20m 5s

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