Avoid overwriting methods when generating 2-to-1 overloads on arbitrary types

[adrhill]

Fixes an oversight in #197 by separating overloads on arbitrary types from methods defined on tracers only, thus avoiding duplicate overwriting of existing methods.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 95.45455% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.74%. Comparing base (9ce962f) to head (ce26ffd).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/overloads/utils.jl	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   91.05%   90.74%   -0.32%     
==========================================
  Files          47       47              
  Lines        2080     2107      +27     
==========================================
+ Hits         1894     1912      +18     
- Misses        186      195       +9     

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