Replace `employment_income` with `irs_employment_income` in `earned_income`

[SirMalamute]

Fixes #4007

copilot:all

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.15%. Comparing base (fff28bf) to head (681a68c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4066   +/-   ##
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  Coverage   99.15%   99.15%           
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  Files        2403     2403           
  Lines       34797    34797           
  Branches      164      164           
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  Hits        34504    34504           
  Misses        261      261           
  Partials       32       32           

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[MaxGhenis]

Per Pavel's question about Maryland TANF, I think we should rename it to irs_earned_income and use a separate earned_income concept for benefit programs that refer to earned income without subtracting pre-tax contributions.

[PavelMakarchuk]

Per Pavel's question about Maryland TANF, I think we should rename it to irs_earned_income and use a separate earned_income concept for benefit programs that refer to earned income without subtracting pre-tax contributions.

Does this relate to this PR or the MD TANF #4223