Remove deprecated SyncClient methods #6573

Job	Run time
cargo-test-sbf (token/program)	9m 39s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 47s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	8m 32s
check	2m 18s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	20m 59s
cargo-test-sbf (token-upgrade/program)	7m 48s
test (single-pool/cli, single-pool/program)	21m 9s
cargo-test-sbf (feature-proposal/program)	10m 1s
test (token-upgrade/cli, token-upgrade/program)	19m 53s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 57s
cargo-test-sbf (memo/program)	9m 29s
cargo-test-sbf (name-service/program)	7m 36s
cargo-test-sbf (stake-pool/program)	14m 58s
cargo-test-sbf (single-pool/program)	8m 30s
	2h 46m 36s

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