fix(feature-activation): add missing metadata migration

[glevco]

Motivation

The feature activation bit counts metadata would be empty causing a max recursion error due to a change caused by #785.

Acceptance Criteria

• Add bit counts calculation in update_initial_metadata().
• Add add_feature_activation_bit_counts_metadata2 migration.
• Change add_feature_activation_bit_counts_metadata migration so it does nothing.

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: 6 lines in your changes are missing coverage. Please review.

Comparison is base (2be371f) 85.25% compared to head (bbcd88a) 85.34%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...ons/add_feature_activation_bit_counts_metadata2.py	68.75%	5 Missing ⚠️
...ions/add_feature_activation_bit_counts_metadata.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #927      +/-   ##
==========================================
+ Coverage   85.25%   85.34%   +0.09%     
==========================================
  Files         288      289       +1     
  Lines       22397    22416      +19     
  Branches     3373     3374       +1     
==========================================
+ Hits        19094    19131      +37     
+ Misses       2625     2614      -11     
+ Partials      678      671       -7     

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