feat: improve mempool error msg when mempool out of sync #6618
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Description
Improved mempool error message when mempool falls behind the persisted blockchain db.
Motivation and Context
This error will occur in an edge case when the mempool is in the process of finalizing a block template and just before it is done, a new block has been added to the blockchain db. As the two processes are asynchronous, the resolution implemented in the code is to return an error message so that the client can issue a new request. Meanwhile, the mempool has time to react to the updated blockchain db state.
How Has This Been Tested?
Compile succeed.
What process can a PR reviewer use to test or verify this change?
Code review.
Breaking Changes