chore: disable Firefox WebTransport interop tests #3916

Job	Run time
Build	2m 52s
Test example js-libp2p-example-browser-pubsub	1m 51s
Test example js-libp2p-example-chat	1m 4s
Test example js-libp2p-example-circuit-relay	1m 10s
Test example js-libp2p-example-connection-encryption	1m 11s
Test example js-libp2p-example-custom-protocols	1m 1s
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 10s
Test example js-libp2p-example-pnet	1m 0s
Test example js-libp2p-example-protocol-and-stream-muxing	2m 22s
Test example js-libp2p-example-pubsub	1m 10s
Test example js-libp2p-example-transports	1m 4s
Test example js-libp2p-example-webrtc-private-to-private	1m 40s
	21m 5s

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