core/consensus: change exponential timer for linear timer

[DiogoSantoss]

Change exponential timer (implemented in #3440) for linear timer.

• First consensus round has 1 second to complete
• Subsequent rounds have linearly more time starting at 400ms (600ms, 800ms, 1s, etc...)

category: refactor
ticket: #3430
feature_flag: linear

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.94%. Comparing base (081e4bc) to head (ba416b2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3470      +/-   ##
==========================================
- Coverage   56.98%   56.94%   -0.05%     
==========================================
  Files         218      218              
  Lines       32519    32524       +5     
==========================================
- Hits        18532    18521      -11     
- Misses      12088    12098      +10     
- Partials     1899     1905       +6     

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[KaloyanTanev]

Approving, but we might want to come up with better name than linear. Something that describes the feature better.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud