Pull apart writeCurrentStakers method - Part 1 #1249

Job	Run time
e2e	7m 7s
Protobuf Lint	7s
Up-to-date protobuf	21s
Up-to-date mocks	2m 5s
e2e_existing_network	3m 9s
Fuzz	12m 27s
Up-to-date go.mod and go.sum	13s
Lint	3m 4s
Upgrade	2m 9s
Unit (macos-12)	5m 7s
Unit (ubuntu-20.04)	4m 26s
Unit (ubuntu-22.04)	4m 41s
Unit (windows-2022)	8m 54s
Unit (self-hosted, linux, ARM64, focal)	1m 12s
Unit (self-hosted, linux, ARM64, jammy)	1m 12s
	56m 14s

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