[Cadence 1.0] Make staged contract code update migration aware of updated system contracts

[turbolent]

Work towards onflow/cadence#3096

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.77%. Comparing base (b9c9109) to head (7e8777d).

Additional details and impacted files

@@                     Coverage Diff                     @@
##           feature/stable-cadence    #5461       +/-   ##
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- Coverage                   56.39%   45.77%   -10.62%     
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  Files                        1032      168      -864     
  Lines                      100711    17081    -83630     
===========================================================
- Hits                        56796     7819    -48977     
+ Misses                      39605     8581    -31024     
+ Partials                     4310      681     -3629     

Flag	Coverage Δ
unittests	45.77% <ø> (-10.62%)	⬇️

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[SupunS]

Given the system-contract migration runs before the staged-contract migration, aren't the updated system-contracts available from the state?

[turbolent]

Ah, it might be that this isn't necessary anymore. I ran into it initially, but the migration pipeline changed quite a bit since then