Remove subnetIDs from uptime manager #8303

Job	Run time
Fuzz	14m 15s
e2e_post_etna	10m 51s
Protobuf Lint	9s
e2e_existing_network	4m 10s
Lint	3m 14s
e2e_pre_etna	11m 12s
Upgrade	3m 11s
Unit (macos-12)	7m 25s
Unit (ubuntu-20.04)	4m 28s
Up-to-date protobuf	27s
Unit (ubuntu-22.04)	6m 44s
Up-to-date mocks	2m 2s
Unit (ubuntu-24.04)	4m 27s
Unit (windows-2022)	11m 7s
Up-to-date go.mod and go.sum	8s
Build Antithesis avalanchego images	8m 19s
Unit (custom-arm64-jammy)	12m 22s
Build Antithesis xsvm images	11m 41s
Unit (custom-arm64-noble)	13m 27s
Image build	10m 31s
	2h 20m 10s

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