v1.18: Change DEFAULT_TPU_CONNECTION_POOL_SIZE to 1 (backport of #1014) #3402

Job	Run time
check	0s
cargo-test-sbf (token/program)	9m 16s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 28s
test	0s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 1s
cargo-test-sbf (token-upgrade/program)	8m 30s
cargo-test-sbf (feature-proposal/program)	9m 24s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 53s
cargo-test-sbf (memo/program)	8m 14s
cargo-test-sbf (name-service/program)	9m 54s
cargo-test-sbf (stake-pool/program)	12m 22s
cargo-test-sbf (single-pool/program)	10m 0s
	1h 45m 2s

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