[Merged by Bors] - fallback to PoW if cannot recertify for poet

[poszu]

Motivation

Fallback to PoW if cannot recertify after poet registration failed with 401 (unauthorized).

Description

Test Plan

added a test covering this scenario

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: Patch coverage is 62.06897% with 11 lines in your changes missing coverage. Please review.

Project coverage is 81.9%. Comparing base (f46277b) to head (c734c48).
Report is 1 commits behind head on develop.

Files	Patch %	Lines
activation/certifier.go	40.0%	3 Missing and 3 partials ⚠️
activation/poet.go	70.0%	2 Missing and 1 partial ⚠️
sql/localsql/certifier/db.go	77.7%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #6197    +/-   ##
========================================
  Coverage     81.8%   81.9%            
========================================
  Files          302     301     -1     
  Lines        32539   32416   -123     
========================================
- Hits         26631   26554    -77     
+ Misses        4180    4139    -41     
+ Partials      1728    1723     -5     

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[poszu]

bors merge

[spacemesh-bors]

Pull request successfully merged into develop.

Build succeeded:

• ci-status
• systest-status