chore(feature-activation): phased testing adjustments

[glevco]

Depends on #927

Motivation

Clean up Phased Testing artifacts from testnet, so we can update its Evaluation Interval from 2 weeks to 1 week, making it the same as mainnet.

Acceptance Criteria

• Remove NOP feature configs from testnet config files.
• Update the testnet Evaluation Interval from 40320 to 20160 blocks (1 week), so it's the same as mainnet.
• Update the testnet default threshold to 15120 blocks (75% of the Evaluation Interval).
• Fix NOP feature logging in HathorManager to support mainnet features.
• Add a migration to clean testnet Phased Testing metadata.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

The base branch was changed.

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (b6748ee) 85.37% compared to head (bc3dfca) 85.33%.

Files	Patch %	Lines
...n/storage/migrations/remove_second_nop_features.py	52.17%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #931      +/-   ##
==========================================
- Coverage   85.37%   85.33%   -0.04%     
==========================================
  Files         289      290       +1     
  Lines       22416    22437      +21     
  Branches     3374     3377       +3     
==========================================
+ Hits        19138    19147       +9     
- Misses       2608     2621      +13     
+ Partials      670      669       -1     

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