perf: Use new `Packet` and `PacketArray` types #18959

Job	Run time
cargo-test-sbf (associated-token-account)	9m 23s
cargo-test-sbf (feature-proposal)	6m 32s
cargo-test-sbf (instruction-padding)	5m 49s
cargo-test-sbf (memo)	6m 5s
check (associated-token-account)	1m 56s
check (feature-proposal)	2m 40s
test_cli (single-pool)	17m 59s
check (instruction-padding)	2m 44s
cargo-test-sbf (record)	8m 53s
test_cli (token-2022)	16m 42s
check (memo)	1m 30s
cargo-test-sbf (single-pool)	6m 41s
check (record)	53s
check (single-pool)	2m 11s
cargo-test-sbf (slashing)	11m 53s
cargo-test-sbf (stake-pool)	10m 43s
cargo-test-sbf (token-2022)	7m 2s
check (slashing)	4m 10s
check (stake-pool)	2m 11s
check (token-2022)	4m 3s
	2h 10m 0s

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