Fix ITk conversion back-tracking patternRecoInfo

This MR fixes the setting of the patternRecoInfo for conversion back-tracking with ITk. The deprecated SLHCConversion flag is thus replaced with the appropriate ROIConv flag.

FYI @nstyles @ncalace @jezequel

This merge request affects 5 files:

• Event/xAOD/xAODTracking/xAODTracking/TrackingPrimitives.h
• InnerDetector/InDetRecTools/SiTrackMakerTool_xk/src/SiTrackMakerITk_xk.cxx
• InnerDetector/InDetRecTools/SiTrackMakerTool_xk/src/SiTrackMaker_xk.cxx
• Tracking/TrkEvent/TrkTrack/TrkTrack/TrackInfo.h
• Tracking/TrkEvent/TrkTrack/src/TrackInfo.cxx

Adding @goetz ,@amorley ,@akraszna ,@gavrilen ,@sroe ,@jsandesa as watchers

added 21.9 EDM InnerDetector Tracking review-pending-level-1 labels

CI Result SUCCESS (hash c77ee080)

	Athena
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 66
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 45127]

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

merged

mentioned in commit 5c2036c3

added sweep:ignore label