Add get_evalml_requirements_file

[jeremyliweishih]

Fixes #4033.

[codecov]

Codecov Report

Merging #4034 (4d3e513) into main (33eb2c6) will increase coverage by 0.1%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #4034     +/-   ##
=======================================
+ Coverage   99.7%   99.7%   +0.1%     
=======================================
  Files        349     349             
  Lines      37472   37489     +17     
=======================================
+ Hits       37354   37371     +17     
  Misses       118     118             

Impacted Files	Coverage Δ
evalml/tests/utils_tests/test_cli_utils.py	100.0% <100.0%> (ø)
evalml/utils/cli_utils.py	96.8% <100.0%> (+0.2%)	⬆️

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