Add a new test with ATLFASTIIF_G4MS simulator

Adding a new test in FastChain with ATLFASTIIF_G4MS simulator.

Discussed in https://its.cern.ch/jira/browse/ATLASSIM-4455

@jchapman, @vpascuzz.

This merge request affects 1 package:

• Simulation/FastSimulation/FastChainPileup

Adding @jchapman ,@vpascuzz as watchers

added 21.3 Simulation review-pending-level-1 labels

CI Result SUCCESS (hash 6ec36d16)

	Athena
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 159
For experts only: Jenkins output [CI-MERGE-REQUEST 42844]

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

merged

mentioned in commit 39a2f074

added sweep:ignore label

mentioned in merge request !31887 (merged)

mentioned in commit a2a70552