fix: parsing ExecutionRequests from EL

[ensi321]

• Move DEPOSIT_REQUEST_TYPE, WITHDRAWAL_REQUEST_TYPE and CONSOLIDATION_REQUEST_TYPE spec constants
• Previous PR feat: exclude empty requests in execution requests list #7196 incorrectly extracts request type from ExecutionRequestsRpc. This PR fixes it by 1) stripping out 0x 2) extract the first 2 character of the remaining hex string for request type.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.61%. Comparing base (b5fb76c) to head (f60836e).
Report is 31 commits behind head on devnet-5.

Additional details and impacted files

@@             Coverage Diff              @@
##           devnet-5    #7314      +/-   ##
============================================
+ Coverage     48.50%   48.61%   +0.11%     
============================================
  Files           600      603       +3     
  Lines         40150    40449     +299     
  Branches       2058     2065       +7     
============================================
+ Hits          19475    19666     +191     
- Misses        20637    20745     +108     
  Partials         38       38              

[twoeths]

we should have unit tests for the extract and parse of execution requests

[nflaig]

we should have unit tests for the extract and parse of execution requests

could add those later, would be good to get all PRs merged to devnet-5 branch to get an image build to run on kurtosis

[nflaig]

LGTM - can address #7317 later, will collect some "real world" test data using Kurtosis using an EL that has implemented the changes arleady