Move TrigT2BeamSpot from FexAlgo to AthReentrantAlgorithm. Removes Run 2 operation

Make T2VertexBeamSpot an AthReentrantAlgorithm. Can no longer run in Run 2 mode - part of ATR-22712.

This merge request affects 1 package:

• Trigger/TrigAlgorithms/TrigT2BeamSpot

This merge request affects 9 files:

• Trigger/TrigAlgorithms/TrigT2BeamSpot/CMakeLists.txt
• Trigger/TrigAlgorithms/TrigT2BeamSpot/TrigT2BeamSpot/T2VertexBeamSpot.h
• Trigger/TrigAlgorithms/TrigT2BeamSpot/TrigT2BeamSpot/T2VertexBeamSpotTool.h
• Trigger/TrigAlgorithms/TrigT2BeamSpot/python/T2VertexBeamSpotConfig.py
• Trigger/TrigAlgorithms/TrigT2BeamSpot/src/T2SplitVertex.h
• Trigger/TrigAlgorithms/TrigT2BeamSpot/src/T2Track.h
• Trigger/TrigAlgorithms/TrigT2BeamSpot/src/T2Vertex.h
• Trigger/TrigAlgorithms/TrigT2BeamSpot/src/T2VertexBeamSpot.cxx
• Trigger/TrigAlgorithms/TrigT2BeamSpot/src/T2VertexBeamSpotTool.cxx

Adding @mvozak ,@bernius as watchers

added Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash c742ff54)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 28135]

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

merged

mentioned in commit 9839a9de

added sweep:ignore label