Change to allow "staging" geometries to be run on existing hits

To allow checks of reduced scenarios for staged ITk insertion, we would like to be able to re-run on existing HITS with geometries that have fewer Pixel modules. This implements a few checks to avoid access/processing of DetectorElements that don't exist in these reduced geometries. These are false by default, which should maintain current behaviour.

FYI @tstreble @ncalace

added 21.9 ITk labels

changed the description

This merge request affects 2 packages:

• InnerDetector/InDetConditions/PixelConditionsTools
• InnerDetector/InDetDigitization/PixelDigitization

Affected files list will not be printed in this case

Adding @goetz ,@jchapman ,@battagl ,@sroe ,@stsuno ,@lshan as watchers

added Digitization InnerDetector review-pending-level-1 labels

CI Result SUCCESS (hash c9f4c901)

	Athena
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 104
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 33361]

mentioned in merge request !43413 (merged)

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

merged

mentioned in commit a4c52542

added sweep:ignore label