Backport: Improve events emitted by node when post proofing

[fasmat]

Motivation

Backport of #5139 to v1.3

Changes

• backports [Merged by Bors] - Remove PoET round 4 work around #5139
• updates changelog
• prepares for release v1.3.4

Test Plan

n/a

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (06c8efe) 77.3% compared to head (3367de9) 77.3%.
Report is 1 commits behind head on v1.3.

Files	Patch %	Lines
activation/nipost.go	74.2%	7 Missing and 2 partials ⚠️
api/grpcserver/post_client.go	50.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.3   #5470     +/-   ##
=======================================
- Coverage   77.3%   77.3%   -0.1%     
=======================================
  Files        260     260             
  Lines      30642   30650      +8     
=======================================
- Hits       23701   23697      -4     
- Misses      5446    5455      +9     
- Partials    1495    1498      +3     

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