cluster: fix SSZ BytesN issue

[corverroos]

Fixes the SSZ issue that didn't ensure BytesN are always of length N. This is only included in v1.5 onwards.

Also removes the lock.DistributedValidator.FeeRecipient field completely, also for previous versions as this isn't used at all and we do not need to support it for older versions.

category: bug
ticket: #1689

[codecov]

Codecov Report

Base: 54.55% // Head: 54.21% // Decreases project coverage by -0.35% ⚠️

Coverage data is based on head (cafdf08) compared to base (02c7290).
Patch coverage: 55.66% of modified lines in pull request are covered.

❗ Current head cafdf08 differs from pull request most recent head dfa0bb4. Consider uploading reports for the commit dfa0bb4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1695      +/-   ##
==========================================
- Coverage   54.55%   54.21%   -0.35%     
==========================================
  Files         159      159              
  Lines       20620    20678      +58     
==========================================
- Hits        11250    11210      -40     
- Misses       7876     7957      +81     
- Partials     1494     1511      +17     

Impacted Files	Coverage Δ
cluster/lock.go	56.41% <25.00%> (-1.70%)	⬇️
cluster/ssz.go	69.92% <50.00%> (-5.14%)	⬇️
cluster/helpers.go	61.14% <70.00%> (+1.29%)	⬆️
cluster/distvalidator.go	87.50% <100.00%> (-0.97%)	⬇️
core/qbft/qbft.go	73.73% <0.00%> (-10.09%)	⬇️
app/vmock.go	73.05% <0.00%> (-3.11%)	⬇️
app/app.go	63.39% <0.00%> (-0.72%)	⬇️
core/aggsigdb/memory.go	84.44% <0.00%> (+1.48%)	⬆️

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