BF: Recreate .js file when piloting in JS

[TEParsons]

Otherwise, in order to see the changes you just made to an experiment, you'd need to either click "compile JS" or delete the .js file to see it in the local debug

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 50.55%. Comparing base (c912dfa) to head (f996df8).
Report is 2 commits behind head on release.

Additional details and impacted files

@@             Coverage Diff             @@
##           release    #6920      +/-   ##
===========================================
+ Coverage    40.99%   50.55%   +9.56%     
===========================================
  Files          332      332              
  Lines        61215    61216       +1     
===========================================
+ Hits         25095    30950    +5855     
+ Misses       36120    30266    -5854     

Components	Coverage Δ
app	∅ <ø> (∅)
boilerplate	∅ <ø> (∅)
library	∅ <ø> (∅)
vm-safe library	∅ <ø> (∅)