Invalid fork name ShanghaiToCancunAtTime15k in state_tests.

[chfast]

The ShanghaiToCancunAtTime15k is invalid fork name in a StateTest because they execute single transaction/block. You need to pick Shanghai or Cancun during test generation.

[marioevz]

Upon taking a look of the tests that do this:

• test_blob_type_tx_pre_fork
• test_point_evaluation_precompile_before_fork
• test_blobbasefee_before_fork

The idea behind these tests was that, on the blockchain-test version, the fork configuration contains the scheduled upcoming fork.

So it might be worth it to do the fix as you suggested on discord, where we pass the fork that is enabled according to the block timestamp and number to the state test, while we use the transition fork for the blockchain test version.