Use a window in batch generator to calculate num txns to be pulled from mempool #61925

Job	Run time
file_change_determinator	10s
rust-doc-tests	5m 40s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-unit-tests	0s
rust-cargo-deny	1m 45s
rust-build-cached-packages	2m 56s
general-lints	1m 52s
rust-smoke-tests	13m 19s
rust-lints	4m 13s
rust-cryptohasher-domain-separation-check	0s
rust-targeted-unit-tests	10m 45s
	40m 40s

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