Run full epoch transitions from EF tests

[michaelsproul]

We may as well run the full epoch transition tests

For now they are ignored by:

• Fulu EF tests v1.6.0-alpha.0 #7540

There were a few weird failures when I tried to run them, I will investigate.

[michaelsproul]

• Test format is described here: https://github.com/ethereum/consensus-specs/blob/master/tests/formats/epoch_processing/README.md
• Update the EpochProcessing runner in testing/ef_tests/src/cases/epoch_processing.rs so that it reads pre_epoch.ssz_snappy and post_epoch.ssz_snappy
• Add logic to run the full epoch transition from pre_epoch state, and verify that it matches post_epoch state (run this in addition to the current sub-transitions, just for thoroughness)
• Remove related ignore patterns from check_all_files_accessed.py. This script checks we are using all test cases provided (minus exceptions), and is called when we run make run-ef-tests.