Clean capella (#4019)

## Issue Addressed

Cleans up all the remnants of 4844 in capella. This makes sure when 4844 is reviewed there is nothing we are missing because it got included here 

## Proposed Changes

drop a bomb on every 4844 thing 

## Additional Info

Merge process I did (locally) is as follows:
- squash merge to produce one commit
- in new branch off unstable with the squashed commit create a `git revert HEAD` commit
- merge that new branch onto 4844 with `--strategy ours`
- compare local 4844 to remote 4844 and make sure the diff is empty
- enjoy

Co-authored-by: Paul Hauner <paul@paulhauner.com>

testing/ef_tests/src/cases/common.rs

@@ -66,7 +66,6 @@ pub fn previous_fork(fork_name: ForkName) -> ForkName {
         ForkName::Altair => ForkName::Base,
         ForkName::Merge => ForkName::Altair, // TODO: Check this when tests are released..
         ForkName::Capella => ForkName::Merge, // TODO: Check this when tests are released..
-        ForkName::Eip4844 => ForkName::Capella, // TODO: Check this when tests are released..
     }
 }