Switch build_tpu_quic_client to actually connect to the given validator #15299

Job	Run time
check	3m 43s
cargo-test-sbf (token/program)	6m 16s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	15m 27s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 47s
test (single-pool/cli, single-pool/program)	15m 35s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	7m 35s
test (token-upgrade/cli, token-upgrade/program)	11m 58s
cargo-test-sbf (token-upgrade/program)	7m 54s
cargo-test-sbf (feature-proposal/program)	6m 10s
cargo-test-sbf (governance/addin-mock/program, governance/program)	9m 34s
cargo-test-sbf (name-service/program)	7m 29s
cargo-test-sbf (stake-pool/program)	8m 59s
cargo-test-sbf (single-pool/program)	6m 50s
	2h 1m 17s

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