Deprecate initial_state

[csookim]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.86%. Comparing base (49b6572) to head (4f6ac8e).

Additional details and impacted files

@@            Coverage Diff             @@
##              0.1    #1106      +/-   ##
==========================================
- Coverage   69.88%   69.86%   -0.02%     
==========================================
  Files          64       64              
  Lines        6880     6876       -4     
==========================================
- Hits         4808     4804       -4     
  Misses       2072     2072              

Flag	Coverage Δ
unittests	69.86% <ø> (-0.02%)	⬇️

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