MuonReadoutElementR4 - Declare the posInstation as protected data member

There's no need for other clients to call that one.

This merge request affects 1 package:

• MuonSpectrometer/MuonPhaseII/MuonDetDescr/MuonReadoutGeometryR4

This merge request affects 1 file:

• MuonSpectrometer/MuonPhaseII/MuonDetDescr/MuonReadoutGeometryR4/MuonReadoutGeometryR4/MuonReadoutElement.h

Adding @pscholer ,@rosati ,@kluit ,@jojungge ,@apsallid ,@stavrop as watchers

added MuonSpectrometer Upgrade main review-pending-level-1 labels

CI Result SUCCESS (hash b057f332)

	Athena	AthSimulation
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 8175] (remote access info)

Change looks fine and the CI is good. Approving. Clara (L1)

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

merged

mentioned in commit 0b0212d6