chore(blockchain): Enforce unused fields in Eth1Data

[shotes]

Ensure that the unused fields are unused with validation:

• This ensures that the unused fields cannot change the HashTreeRoot of the BeaconBlock
• Better supports compatibility with future updates to the protocol, ensuring that these fields are unused at previous iterations.

Edit: This likely won't make it into the mainnet release. If that is the case, this PR will have to be reworked with extra forking logic.

[codecov]

Codecov Report

Attention: Patch coverage is 34.78261% with 15 lines in your changes missing coverage. Please review.

Project coverage is 31.25%. Comparing base (5dfa536) to head (6cbe5fc).

Files with missing lines	Patch %	Lines
consensus-types/types/eth1data.go	31.81%	10 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2382      +/-   ##
==========================================
- Coverage   31.26%   31.25%   -0.01%     
==========================================
  Files         346      346              
  Lines       15434    15455      +21     
  Branches       20       20              
==========================================
+ Hits         4825     4831       +6     
- Misses      10272    10282      +10     
- Partials      337      342       +5     

Files with missing lines	Coverage Δ
state-transition/core/state_processor_genesis.go	41.52% <100.00%> (ø)
consensus-types/types/eth1data.go	68.75% <31.81%> (-19.63%)	⬇️