Reduce the number of files in MG gridpacks

As discussed in ATLMCPROD-8537, there are a large number of files in the LO MadGraph gridpacks that we are currently keeping but don't actually need. This MR removes them, keeping only the integration grids and the results.dat.

For NLO gridpacks, also remove the events.lhe and optional events.lhe.rwgt files created for the original gridpack run.

assigned to @ravinab

WARNING: big files (>100K) are found in the changeset

116K in file Generators/MadGraphControl/python/MadGraphUtils.py

This merge request affects 1 package:

• Generators/MadGraphControl

This merge request affects 1 file:

• Generators/MadGraphControl/python/MadGraphUtils.py

Adding @zmarshal as watcher

added 21.6 Generators review-pending-level-1 labels

CI Result SUCCESS (hash 228c3a24)

	AthGeneration
externals
cmake
make
required tests
optional tests

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AthGeneration: number of compilation errors 0, warnings 4
For experts only: Jenkins output [CI-MERGE-REQUEST-GCC62-CC7 1843]

The changes look fine and the CI issues are unrelated. Approving.

Jason (L1)

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

mentioned in commit d8b8fc72

merged

added 1 deleted label

added sweep:done label

picked the changes into the branch cherry-pick-d8b8fc72779-master with commit 7754ab76

mentioned in commit 7754ab76

Sweep summary
successful:

• master

(see https://aiatlas154.cern.ch/jenkins/job/auto_git_sweeps/2999/console for details)

mentioned in merge request !55955 (merged)

mentioned in commit 56972946