Fix memory blowup issues with anomaly detection trigger chains

This MR is to fix the memory blowup issues by !78373 (merged)

There was a mistake in the increment of each object count, which resulted in the blowup of the size of input tensors of the AD onnx model. It has been confirmed that the memory blowup issue is resolved by this fix: https://its.cern.ch/jira/browse/ATR-30927

All AD trigger chains disabled in !78504 (merged) will be reenabled by this change.

It also includes some minor fixes on the handling of Gaudi::Property variables, but this is not relevant to the main issue.

Tagging @martindl , @shanisch , @gipezzul , @khoo , @tamartin , @drankin , @mmcohen