manual cherry-pick of !54630: introduce a new set of ASG test files (ATLASG-1636)

This is now an extended set of files to cover the different kinds of files we may use as input in analysis.

Disabled some tests that don't currently work on DAOD_PHYS.

This contains a fix to e-gamma tools which avoids an endless recursion in some cases, and avoids repeated look-ups of the EventContext at the same.