Add MerkleDB Snapshots #7927

Job	Run time
e2e_pre_etna	11m 23s
e2e_post_etna	11m 14s
Protobuf Lint	5s
Up-to-date protobuf	3m 4s
Up-to-date mocks	4m 30s
e2e_existing_network	6m 20s
Fuzz	13m 18s
Up-to-date go.mod and go.sum	9s
Lint	3m 13s
Build Antithesis avalanchego images	12m 4s
Build Antithesis xsvm images	11m 39s
Image build	10m 30s
Unit (macos-12)	8m 18s
Upgrade	3m 10s
Unit (ubuntu-20.04)	3m 59s
Unit (ubuntu-22.04)	6m 50s
Unit (windows-2022)	11m 35s
Unit (custom-arm64-focal)	8m 22s
Unit (custom-arm64-jammy)	12m 5s
	2h 21m 48s

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