feat: replace ews with zkboost

[han0110]

• Replace EWS with zkboost
  • The proof request is initiated by CL now (previously done by EWS when new head arrives)
  • The execution witness fetching job is moved to zkboost, so it still needs EL endpoint
• Update the test yaml from ews.yaml to zkboost.yaml
  • Use normal CL for now, will need to be updated to the image of CL with optional proof support (for example feat: eip8025 eth-act/lighthouse#16)
  • Use mock zkVM that just execute the guest program on host, Ere configuration is left to future PR

[barnabasbusa]

Can you please update the documentation too to match all the changes?

[han0110]

Updated in dbf5077