Fix missing epoch on peer authentication messages requests

[sstanculeanu]

Description of the reasoning behind the pull request (what feature was missing / how the problem was manifesting itself / what was the motive behind the refactoring)

• epoch is missing from RequestData object, while requesting peer authentication messages, leading to always requesting from epoch 0, which sometimes therefore leads to querying nodes from full history list, which may be empty

Proposed Changes

• add epoch on RequestData object

Testing procedure

• standard system test, looking for peer list is empty or errors during the sending, topic: peerAuthentication not to be present

[codecov-commenter]

Codecov Report

Merging #4450 (f92e704) into rc/2022-july (662828d) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           rc/2022-july    #4450      +/-   ##
================================================
- Coverage         73.93%   73.93%   -0.01%     
================================================
  Files               679      679              
  Lines             86960    86965       +5     
================================================
+ Hits              64292    64295       +3     
- Misses            17865    17866       +1     
- Partials           4803     4804       +1     

Impacted Files	Coverage Δ
dataRetriever/requestHandlers/requestHandler.go	75.10% <100.00%> (+0.15%)	⬆️
...aRetriever/resolvers/peerAuthenticationResolver.go	94.82% <100.00%> (+0.09%)	⬆️
storage/txcache/txListBySenderMap.go	97.50% <0.00%> (-2.50%)	⬇️

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[gabi-vuls]

System test passed.