BF: Plugin Components weren't recognised if experiment loaded with app

[TEParsons]

Fixes #6569

Basically just that activatePlugins wasn't called early enough - moving it up in the script fixes this just fine.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 41.15%. Comparing base (a8321ef) to head (e31aebf).
Report is 11 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #6707      +/-   ##
==========================================
+ Coverage   41.14%   41.15%   +0.01%     
==========================================
  Files         332      332              
  Lines       61140    61139       -1     
==========================================
+ Hits        25155    25163       +8     
+ Misses      35985    35976       -9     

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