fix: remove extra v1 testing code and enable replacement migrators

[beckermr]

Description:

Enables replacement migrations for v1 and fixes v1 testing bugs.

Checklist:

• Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

[codecov]

Codecov Report

Attention: Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.76%. Comparing base (50ba17c) to head (c401d09).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
conda_forge_tick/migrators/replacement.py	88.88%	1 Missing ⚠️
conda_forge_tick/utils.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3802      +/-   ##
==========================================
+ Coverage   77.42%   77.76%   +0.33%     
==========================================
  Files         136      136              
  Lines       14904    14779     -125     
==========================================
- Hits        11540    11493      -47     
+ Misses       3364     3286      -78     

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