removes unnecessary allocations in shreds ingestion path #16672

Job	Run time
cargo-test-sbf (associated-token-account)	8m 23s
check (associated-token-account)	1m 21s
check (feature-proposal)	2m 12s
test_cli (single-pool)	18m 12s
check (instruction-padding)	3m 10s
cargo-test-sbf (feature-proposal)	6m 58s
test_cli (token-2022)	16m 30s
check (memo)	1m 22s
cargo-test-sbf (instruction-padding)	6m 21s
check (record)	1m 7s
cargo-test-sbf (memo)	6m 38s
check (single-pool)	3m 39s
cargo-test-sbf (record)	6m 18s
check (slashing)	1m 20s
cargo-test-sbf (single-pool)	8m 38s
check (stake-pool)	2m 52s
cargo-test-sbf (slashing)	15m 10s
check (token-2022)	2m 49s
cargo-test-sbf (stake-pool)	11m 23s
cargo-test-sbf (token-2022)	7m 11s
	2h 11m 34s

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