mempool: modify `maintain_transaction_pool` to prune txs #2212

Job	Run time
Deno tests / test	28s
Deno tests / test	28s
Spell check / spell-check	10s
Spell check / spell-check	10s
Rust tests / test	14m 37s
Rust tests / test	15m 25s
Rust tests / hive-prepare	11m 38s
Rust tests / hive-prepare	11m 38s
Trunk check / Trunk	1m 4s
Trunk check / Trunk	1m 4s
Rust tests / hive-test (ethereum/rpc)	10m 22s
Rust tests / hive-test (ethereum/rpc)	10m 22s
Rust tests / hive-test (ethereum/rpc-compat, debug_getRawReceipts, debug_getRawTransaction/get-tx$, debug_getR...	2m 12s
Rust tests / hive-test (ethereum/rpc-compat, debug_getRawReceipts, debug_getRawTransaction/get-tx$, debug_getR...	2m 12s
	1h 21m 50s

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