Adjusted weight function for new identities

[fasmat]

Motivation

Incentivise reinitialisation by giving identities that have been created after a certain epoch extra weight in their ATXs. This PR adjusts the weight function for identities that have been initialized after the configured epoch.

Description

• Add a new config parameter BonusWeightEpoch that defines the epoch at which new identities start to receive extra
  weight
  • to be eligible for the extra weight an identity must use a commitment ATX that isn't older than
    BonusWeightEpoch-2, any ATX published in or after that epoch and is used as commitment makes an identity eligible
    for the extra weight
  • TODO: right now this epoch is set to 50 and will need to be adjusted before merging this PR
• Weight calculation is updated to use the current formula for all identities with a commitment ATX that is older than
  BonusWeightEpoch-2 or the golden ATX
  • the new formula is used for all new identities
  • newly created identities incrementally receive more weight over 10 epochs: every epoch their weight increases by 10% to a final weight of 2x what an old identity would receive with the same PoST size.
• For fastnet I set epoch 3 as the BonusWeightEpoch so that all identities created after genesis receive the bonus
  weight
• TODO: if relevant existing testnets the BonusWeightEpoch should be set to an epoch in the near future, but not hard coded into testnet preset. Unless this functionality is explicitly tested on a testnet this parameter doesn't need to be set at all.

Test Plan

New unit tests have been added and existing tests have been adjusted for the changed functionality.

TODO

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

[Copilot]

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

[fasmat]

TODO: update to correct value

[fasmat]

bors try

[codecov]

Codecov Report

Attention: Patch coverage is 90.37433% with 18 lines in your changes missing coverage. Please review.

Project coverage is 76.9%. Comparing base (8a6659e) to head (ec1b585).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
activation/handler_v2.go	76.7%	9 Missing and 4 partials ⚠️
activation/handler_v1.go	82.1%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6817     +/-   ##
=========================================
- Coverage     76.9%   76.9%   -0.1%     
=========================================
  Files          369     369             
  Lines        50315   50402     +87     
=========================================
+ Hits         38734   38770     +36     
- Misses        9374    9416     +42     
- Partials      2207    2216      +9     

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