ATLASRECTS-5972. STEP propagator Protect against negative variance

ATLASRECTS-5972.

• STEP propagator Protect against negative variance
• also changes a few fabs to std::abs

WARNING: big files (>100K) are found in the changeset

124K in file Tracking/TrkExtrapolation/TrkExSTEP_Propagator/src/STEP_Propagator.cxx

This merge request affects 1 package:

• Tracking/TrkExtrapolation/TrkExSTEP_Propagator

This merge request affects 1 file:

• Tracking/TrkExtrapolation/TrkExSTEP_Propagator/src/STEP_Propagator.cxx

Adding @amorley ,@gavrilen as watchers

added Tracking master review-pending-level-1 labels

CI Result SUCCESS (hash 3af31ec3)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 31070]

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

Looks good from L1 perspective, approved -- L1

merged

mentioned in commit 2aee6ce7

added sweep:ignore label