[CharInv] Have find-replace auto-save would-be-lost changes

[imnasnainaec]

Fixes #3884 (with solution option 1).

Also, closes the defunct character detail panel for the found-and-replaced character.

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.91%. Comparing base (620aff8) to head (5932ea7).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
...racterInventory/Redux/CharacterInventoryActions.ts	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3937      +/-   ##
==========================================
- Coverage   73.96%   73.91%   -0.05%     
==========================================
  Files         289      289              
  Lines       10562    10567       +5     
  Branches     1326     1326              
==========================================
- Hits         7812     7811       -1     
- Misses       2364     2370       +6     
  Partials      386      386              

Flag	Coverage Δ
backend	85.41% <ø> (ø)
frontend	65.31% <57.14%> (-0.08%)	⬇️

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[jasonleenaylor]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)