chore(sdk): remove deprecated code for importing ovm chain

[emhane]

Removes code that remains from when ovm chain was imported via pipeline

[mattsse]

cool

but we still kinda support pre bedrock import, wouldn't this break @joshieDo ?
or are we dropping support for this because a pain to maintain?

[joshieDo]

afaik we still support it, the receipt import was fixed here: #11216

but i'd be more than happy to drop support for importing prebedrock. But if so, we should remove it from the cli first

[emhane]

cool

but we still kinda support pre bedrock import, wouldn't this break @joshieDo ? or are we dropping support for this because a pain to maintain?

ah yes, thanks @mattsse , we can make a separate reth_downloaders::file_codec::BlockFileCodec for op mainnet import then, will open issue

[emhane]

blocked by #12521