Reduce default from 8 to 1 TVU receive socket/threads #15257

Job	Run time
check	3m 51s
cargo-test-sbf (token/program)	7m 12s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	12m 3s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	7m 38s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 13s
cargo-test-sbf (token-upgrade/program)	7m 35s
test (single-pool/cli, single-pool/program)	17m 1s
cargo-test-sbf (feature-proposal/program)	6m 33s
test (token-upgrade/cli, token-upgrade/program)	15m 53s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 45s
cargo-test-sbf (name-service/program)	7m 14s
cargo-test-sbf (stake-pool/program)	10m 41s
cargo-test-sbf (single-pool/program)	7m 48s
	2h 12m 27s

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