[Indexer-Grpc-V2] Add ConnectionManager. #71831

Job	Run time
permission-check	2s
determine-docker-build-metadata	2s
file_change_determinator	12s
fetch-last-released-docker-image-tag	1m 39s
test-target-determinator	5m 19s
rust-images-failpoints	0s
rust-images-performance	0s
rust-images-consensus-only-perf-test	0s
rust-images / rust-all	13m 28s
forge-consensus-only-perf-test	0s
forge-multiregion-test	0s
node-api-compatibility-tests / node-api-compatibility-tests	49s
faucet-tests-main / run-tests-main	0s
cli-e2e-tests / run-cli-tests	4m 54s
forge-compat-test / forge	13m 6s
forge-e2e-test / forge	32m 49s
forge-framework-upgrade-test / forge	9s
	1h 12m 29s

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