Removes invariant is_serialized_with_abs param

[brooksprumo]

Problem

PrunedBanksRequestHandler::handle_request() takes a parameter, is_serialized_with_abs, that is always called with true. I can't think of a reason why—from this function—we'd want to call AccountsDb::purge_slot() with a different value. So having this parameter seems unnecessary at best, and error-prone at worst.

Summary of Changes

Remove the param.

[jeffwashington]

lgtm
would be useful to look at 1.14 or something and see when it was used and how its use got removed (if ever). maybe that was a mistake.

[brooksprumo]

would be useful to look at 1.14 or something and see when it was used and how its use got removed (if ever).

Looks like this parameter was added back in 2021 here #17319. It has always been true.

The old handle_pruned_banks() was public, so maybe that was to ensure future-proofing if other callers of this function were added. Now, we only call this function from within ABS (or a bank test) (and I'm removing the pub over here #33155), so we'll know there are no non-ABS callers.