[DO NOT MERGE] Add migration to add a key to all service accounts

[janezpodhostnik]

Caution

Do Not Merge

This is an extra migration that adds a public key to all service accounts. The intended usage is for testing the migration of mainnet. This allows us to run transactions on the test migrated mainnet network to setup networking addresses and epoch related state.

this is same as: #6096. I just accidentally closed that one, and I cannot reopen it

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.54%. Comparing base (feabd3a) to head (b239139).

Additional details and impacted files

@@            Coverage Diff             @@
##            v0.37    #6271      +/-   ##
==========================================
+ Coverage   41.46%   43.54%   +2.07%     
==========================================
  Files        2016     1804     -212     
  Lines      143694   124265   -19429     
==========================================
- Hits        59589    54115    -5474     
+ Misses      77927    64551   -13376     
+ Partials     6178     5599     -579     

Flag	Coverage Δ
unittests	43.54% <ø> (+2.07%)	⬆️

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