core/state: no need to delete storage slots in CreateContract since we now have EIP-7610 implemented

work to remove `w.tx.DomainDelPrefix(kv.StorageDomain, address[:], w.txNum)` in `StateWriter.CreateContract` (`state.Writer` implementation is the main one but also check others)

after EIP-7610 (applied retrospectively for all blocks from block 0) we no longer need to do this since if any transaction at any block tries to create a contract which has storage then execution will return a collision error (as per spec) and that happens before we reach the call to `StateWriter.CreateContract` - so we are guarded and calling `DomainDelPrefix(kv.StorageDomain, address[:], w.txNum)` is pointless

when I tried removing it 1 month ago 2 tests failed:
- TestDeleteRecreateSlots
- TestDeleteRecreateSlotsAcrossManyBlocks

they are legit test cases that should pass without `DomainDelPrefix(kv.StorageDomain, address[:], w.txNum)` but I think we have some bug in how we instantiate these tests - something weird happening when initiating the initial state - will debug further