[Do Not Merge] Enable add key migration on Migration Mainnet

[janezpodhostnik]

see: https://github.com/onflow/flow-go/pull/6969 for context

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 43.94%. Comparing base (1d6d1e7) to head (4568767).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6970      +/-   ##
==========================================
+ Coverage   41.12%   43.94%   +2.81%     
==========================================
  Files        2211     1996     -215     
  Lines      193949   169124   -24825     
==========================================
- Hits        79763    74315    -5448     
+ Misses     107574    88756   -18818     
+ Partials     6612     6053     -559     

Flag	Coverage Δ
unittests	43.94% <ø> (+2.81%)	:arrow_up:

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