BackgroundWordFiller: Read Pix/SCT spacepoints directly, bypassing (obsolete)...

Walter Lamplrequested to merge
wlampl/athena:BackgroundWordFiller_noTag into master

BackgroundWordFiller: Read Pix/SCT spacepoints directly, bypassing (obsolete) RawInfoSummaryForTag object

Preparatory step before deleting the RawInfoSummaryForTagWriter algorithm. See also ATLASRECTS-6855

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