add L1 support to getCurrentValidators API #9965

Job	Run time
Up-to-date mocks	1m 56s
Run bootstrap monitor e2e tests	6m 49s
Up-to-date protobuf	25s
Protobuf Lint	8s
e2e_post_etna	13m 45s
e2e_existing_network	4m 31s
e2e_pre_etna	12m 45s
Fuzz	15m 4s
Up-to-date go.mod and go.sum	9s
Lint	3m 37s
Build Antithesis avalanchego images	10m 9s
Build Antithesis xsvm images	13m 3s
Image build	10m 38s
Unit (macos-14)	5m 15s
Unit (ubuntu-20.04)	4m 52s
Upgrade	3m 35s
Unit (ubuntu-22.04)	7m 44s
Unit (ubuntu-24.04)	4m 42s
Unit (windows-2022)	11m 10s
Unit (custom-arm64-jammy)	9m 20s
Unit (custom-arm64-noble)	9m 9s
	2h 28m 46s

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