Remove subnetIDs from uptime manager #8287

Job	Run time
Up-to-date protobuf	21s
Up-to-date mocks	1m 55s
e2e_existing_network	4m 14s
Protobuf Lint	6s
e2e_post_etna	11m 7s
e2e_pre_etna	11m 0s
Fuzz	14m 22s
Up-to-date go.mod and go.sum	13s
Lint	3m 11s
Build Antithesis avalanchego images	8m 16s
Build Antithesis xsvm images	11m 37s
Image build	10m 38s
Unit (macos-12)	9m 26s
Upgrade	3m 13s
Unit (ubuntu-20.04)	4m 36s
Unit (ubuntu-22.04)	6m 44s
Unit (ubuntu-24.04)	4m 27s
Unit (windows-2022)	10m 34s
Unit (custom-arm64-jammy)	13m 9s
Unit (custom-arm64-noble)	12m 39s
	2h 21m 48s

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