fix: remove unused NOP features

[glevco]

Motivation

Clear all metadata related to the unused first Feature Activation Phased Testing.

Acceptance Criteria

• Remove NOP features from testnet config files.
• Add migration for cleaning first 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

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (8261720) 85.46% compared to head (f6dd5c9) 85.26%.

Files	Patch %	Lines
...on/storage/migrations/remove_first_nop_features.py	48.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #901      +/-   ##
==========================================
- Coverage   85.46%   85.26%   -0.20%     
==========================================
  Files         283      284       +1     
  Lines       22305    22330      +25     
  Branches     3363     3367       +4     
==========================================
- Hits        19062    19040      -22     
- Misses       2580     2617      +37     
- Partials      663      673      +10     

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