Fix Unused class rule warning in MuonSimEvent (ATLASSIM-4476)

Hi,

this MR fixes some Unused class rule warnings in MuonSimEvent since the MMSimHitCollection.h is not included in MuonSimEventDict.h. Actually, it is also not included in master, so sweeping to master and 21.9. This MR fixes ATLASSIM-4476.

Best, Nico

This merge request affects 1 package:

• MuonSpectrometer/MuonSimEvent

Adding @rosati ,@nkoehler ,@wleight as watchers

added 21.3 MuonSpectrometer Simulation review-pending-level-1 labels

added alsoTargeting:21.9 + 1 deleted label

CI Result SUCCESS (hash 44c0b4bc)

	Athena
externals
cmake
make
required tests
optional tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 43269]

Looks fine to me. Double checking with L2. Clara (L1)

added review-pending-level-2 label and removed review-pending-level-1 label

Changes look fine, approving.

added review-approved label and removed review-pending-level-2 label

merged

mentioned in commit bc27550a

added sweep:done label

mentioned in commit ca3e7549

mentioned in merge request !31732 (merged)

Sweep summary
successful:

• 21.9
• master

(see https://aiatlas154.cern.ch/jenkins/job/auto_git_sweeps/1111/console for details)

mentioned in commit c8137c4f

mentioned in merge request !31733 (merged)

mentioned in commit f7ed16d3

mentioned in commit 664c5da3

mentioned in merge request !31887 (merged)

mentioned in commit a2a70552