Move promotions.csv file to src/ since we use it for precompile

[quinnj]

No description provided.

[codecov]

Codecov Report

Merging #930 (cbdb2da) into main (137c33f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #930   +/-   ##
=======================================
  Coverage   89.97%   89.98%           
=======================================
  Files           9        9           
  Lines        2284     2286    +2     
=======================================
+ Hits         2055     2057    +2     
  Misses        229      229           

Impacted Files	Coverage Δ
src/precompile.jl	50.00% <100.00%> (ø)
src/utils.jl	86.70% <0.00%> (+0.07%)	⬆️

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