docs: high availability sequencer guide #2403

Job	Run time
Determine Image Tag	2s
lint / golangci-lint	1m 7s
test / Go Mod Tidy Check	30s
lint / goreleaser-check	13s
test / Build All ev-node Binaries	1m 38s
lint / yamllint	14s
test / Run Unit Tests	3m 20s
test / Run Integration Tests	2m 15s
proto / buf-check	11s
lint / hadolint	9s
lint / markdown-lint	22s
docker / Build ev-node-grpc	18m 52s
docker / Build ev-node-testapp	17m 59s
docker / Build ev-node-evm	23m 9s
test / Run EVM Execution Tests	2m 7s
test / Run E2E System Tests	15m 22s
test / Combine and Upload Coverage	10s
docker-tests / Docker Compatibility E2E Tests	4m 29s
docker-tests / Docker E2E Tests	8m 41s
docker-tests / Docker Upgrade E2E Tests	3m 39s
	1h 44m 29s

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