Fix environment clear such that cache is cleared before plugin factories are destroyed

[Levi-Armstrong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.55%. Comparing base (e3db715) to head (1751316).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1062      +/-   ##
==========================================
- Coverage   89.55%   89.55%   -0.01%     
==========================================
  Files         288      288              
  Lines       16290    16290              
==========================================
- Hits        14589    14588       -1     
- Misses       1701     1702       +1     

see 2 files with indirect coverage changes