eth/protocols/snap: fix the flaws in the snap sync (#22553)

* eth/protocols/snap: fix snap sync

* eth/protocols/snap: fix tests

* eth: fix tiny

* eth: update tests

* eth: update tests

* core/state/snapshot: testcase for #22534

* eth/protocols/snap: fix boundary loss on full-but-proven range

* core/state/snapshot: lintfix

* eth: address comment

* eth: fix handler

Co-authored-by: Martin Holst Swende <martin@swende.se>
Co-authored-by: Péter Szilágyi <peterke@gmail.com>