Removing __init__.py copy step in *_env_gen.yml files for v3

[gavin-aguiar]

Description

Porting #972 to v3

Fixes #

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PR information

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• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made and CI is passing.

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[codecov]

Codecov Report

Merging #1074 (729c189) into v3.x-dev (e78e2e3) will not change coverage.
The diff coverage is n/a.

❗ Current head 729c189 differs from pull request most recent head f36ae74. Consider uploading reports for the commit f36ae74 to get more accurate results

@@            Coverage Diff            @@
##           v3.x-dev    #1074   +/-   ##
=========================================
  Coverage     82.43%   82.43%           
=========================================
  Files            33       33           
  Lines          1657     1657           
  Branches        265      265           
=========================================
  Hits           1366     1366           
  Misses          226      226           
  Partials         65       65           

Flag	Coverage Δ
unittests	82.43% <ø> (ø)

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