fix: update mempool garbage collection logic for 3.0 (#2117) #2554

Job	Run time
test-rosetta (rosetta)	2m 59s
test-2_5 (block-zero-handling)	1m 23s
test (api)	13m 43s
lint	55s
test-rosetta (rosetta-construction)	2m 30s
test (bns)	3m 14s
test-2_5 (faucet-stx)	1m 20s
test-rosetta (rosetta-cli-data)	2m 9s
test-2_5 (pox-4-btc-address-formats)	2m 8s
test (bns-e2e)	7m 15s
test-rosetta (rosetta-cli-construction)	2m 39s
test-2_5 (pox-4-delegate-aggregation)	2m 0s
test (btc-faucet)	3m 56s
test-2_5 (pox-4-delegate-stacking)	1m 44s
test (event-replay)	1m 58s
test-2_5 (pox-4-delegate-revoked-stacking)	2m 28s
test (rpc)	1m 26s
test-2_5 (pox-4-stack-extend-increase)	2m 24s
test-2_5 (pox-4-rosetta-btc-addr-types)	5m 11s
test-2_5 (pox-4-rosetta-cycle-phases)	1m 16s
test-2_5 (pox-4-rosetta-segwit)	1m 34s
test-2_5 (pox-4-burnchain-stack-stx)	1m 29s
test-2_5 (pox-4-burnchain-delegate-stx)	2m 5s
build-publish	0s
	1h 7m 46s

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