Remove pre-Durango networking checks (#3018) #5175

Job	Run time
Fuzz	13m 1s
Unit (macos-12)	13m 14s
Unit (ubuntu-20.04)	6m 50s
e2e	11m 15s
Unit (ubuntu-22.04)	6m 51s
e2e_existing_network	4m 6s
Upgrade	3m 20s
Unit (windows-2022)	12m 17s
Unit (self-hosted, linux, ARM64, focal)	1m 10s
Up-to-date mocks	2m 12s
Unit (self-hosted, linux, ARM64, jammy)	1m 11s
Protobuf Lint	5s
Up-to-date protobuf	28s
Up-to-date go.mod and go.sum	14s
Lint	3m 4s
govulncheck	1m 16s
Antithesis avalanchego build	5m 47s
Image build	10m 36s
	1h 36m 57s

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