*: Txn() function signature refactor and remove ActivePendingTxn() (#8327) #8570
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What problem does this PR solve?
Cherry pick from #8327
What is changed and how it works?
I thought #8327 is just a simple refactor, so I did not cherry pick that to release 2.0
But later it turns out that without the commit, release 2.0 will fail on this test #8566
@crazycs520 @winkyao
This change is