[Bug]: pow engine mempool seenId cache not clear on time

[ze97286]

Problem encountered

on performance testing we see transactions rejected as already seen although they never end up being included in a block which eventually fails the test (e.g votes not passing, proposals not going through):

2023-11-10T10:02:50.599Z        INFO    core.protocol.pow       pow/engine.go:297       mempool seen cleared
2023-11-10T10:02:50.601Z        ERROR   core.protocol.pow       pow/engine.go:163       mempoolSeenTid =        {"PowID": "992f8844d5a078f4102817b09242451a9b246b951b6ee3f015d27d3ccb9ae39d"}
2023-11-10T10:02:50.602Z        ERROR   core.protocol.pow       pow/engine.go:157       tid already seen        {"tid": "992f8844d5a078f4102817b09242451a9b246b951b6ee3f015d27d3ccb9ae39d", "party": "e0954e3b5c478f990b23614ca50b2dee6a28be2b81ba5f20c17305057f842005", "command": "Proposal"}
2023-11-10T10:02:51.106Z        INFO    core.protocol.pow       pow/engine.go:297       mempool seen cleared

Proposing and voting in new market..........................FAILED
Error: no pending proposals found

Observed behaviour

Transaction that were not included in a block gets rechecked and fail as the node says it's already seen them and they get rejected as the mempoolid cache (which is meant to prevent parties from spamming a specific validator with transactions that are gonna fail checkTx) is not cleared on time.

Expected behaviour

The mempool cache in pow engine should be cleared on commit, not on finalize.

Steps to reproduce

1. Submit `xyz` transaction
2. With this payload
3. Query `abc` API
4. Observe the error

Software version

develop

Failing test

No response

Jenkins run

No response

Configuration used

No response

Relevant log output

No response