Add SiSPSeededSCTTracksStandalone.py to SiSPSeededTrackFinder package (ATLASRECTS-3037)

Susumu Odarequested to merge
oda/athena:master-SiSPSeededSCTTracks into master

Add SiSPSeededSCTTracksStandalone.py to SiSPSeededTrackFinder package.

This job option is useful to test SCT standalone track reconstruction.

Some fixes were needed to run the job option.

Edited by Susumu Oda

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