refactor: rpc pool #1052

Job	Run time
system-programs (token-escrow-test, [ "cargo test-sbf -p token-escrow" ])	16m 2s
system-programs (sdk-test-program, ["cargo-test-sbf -p sdk-test"])	14m 38s
system-programs (counter-test, ["cargo test-sbf -p counter"])	9m 56s
system-programs (sdk-anchor-test-program, ["cargo-test-sbf -p sdk-anchor-test"])	8m 31s
	49m 7s

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