chore: remove fork db snapshot

[mattsse]

this fixes an inconsistency highlited by #6463

fork db snapshots were always kept on revert, but state snapshots were always removed, the intended behaviour (ganache, hardhat compat) is to remove a snapshot on evm_revert

also related

#6366

[Evalir]

Im fine with removing this as it's causing a lot of trouble for anvil users, but this will break existing test suites which now depend on this behavior, aave's included.

[mattsse]

but this will break existing test suites which now depend on this behavior, aave's included.

forge is unaffected by this.
this merely fixes a bug in anvil

FYI @naps62 there's now a RevertAction parameter this will be useful when integrating the optional bool param to evm_revert request