Remove list_variable_types utility

[tamargrey]

Removes the deprecated utility list_variable_types.

Closes #1613

[rwedge]

LGTM

[codecov]

Codecov Report

Merging #1929 (2eb2ca2) into main (068887e) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1929      +/-   ##
==========================================
- Coverage   98.99%   98.99%   -0.01%     
==========================================
  Files         150      146       -4     
  Lines       16456    16438      -18     
==========================================
- Hits        16291    16273      -18     
  Misses        165      165              

Impacted Files	Coverage Δ
featuretools/__init__.py	73.33% <ø> (-0.58%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 068887e...2eb2ca2. Read the comment docs.

[rwedge]

@gsheni will adding a requirement to this file lead to any issues if the minimum dependency checker decides to update the file? Is it possible it would get overwritten if the dependency checker isn't tracking it?

[gsheni]

This is not the way to do this. You need to put responses>=0.X.X,<0.19.0 in the main requirements.txt/test-requirements.txt. Then in minimum_test_requirements.txt you need to put the lowest responses requirement.

[tamargrey]

So the min responses version on the latest moto is 0.9.0 and it has been since moto v1.3.5 (our min version of moto). I'll make the changes to test-requirements and minimum_test_requirements.