Notes about failing tests in MadGraphControl

Adding a few notes for anyone who tries to debug some of these jobs about the progress that's been made. The tests aren't all working quite yet, unfortunately.

This merge request affects 1 package:

• Generators/MadGraphControl

Adding @zmarshal as watcher

added 21.6 Generators review-pending-level-1 labels

CI Result SUCCESS (hash 14dae6d8)

	AthGeneration
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
AthGeneration: number of compilation errors 0, warnings 1
For experts only: Jenkins output [CI-MERGE-REQUEST 43444]

Simple code annotations, approving --L1

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit da09d911

added sweep:ignore label