removes redundant allocations when generating new gossip pull/push messages #18202

Job	Run time
check (associated-token-account)	1m 34s
test_cli (single-pool)	17m 30s
check (feature-proposal)	1m 58s
test_cli (token-2022)	20m 22s
check (instruction-padding)	2m 23s
check (memo)	2m 47s
check (record)	2m 40s
cargo-test-sbf (associated-token-account)	7m 44s
check (single-pool)	2m 42s
cargo-test-sbf (feature-proposal)	7m 17s
check (slashing)	1m 5s
cargo-test-sbf (instruction-padding)	6m 43s
check (stake-pool)	3m 12s
cargo-test-sbf (memo)	6m 29s
check (token-2022)	2m 58s
cargo-test-sbf (record)	8m 30s
cargo-test-sbf (single-pool)	7m 39s
cargo-test-sbf (slashing)	15m 19s
cargo-test-sbf (stake-pool)	13m 19s
cargo-test-sbf (token-2022)	6m 53s
	2h 19m 4s

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