[ATR-23079] Add TDT to legacy trigger RecExCommon

In ATR-23079 I encountered a workflow by which we get to the xAOD trigger decision creation for Run 2 (which uses the TrigDecisionTool to facilitate the xAOD conversion) before anything else has set up the TDT.

This adds the tool at this point, before setting the specific settings required for it to function in this conversion mode.

This merge request affects 1 package:

• Trigger/TrigAnalysis/TrigDecisionMaker

This merge request affects 1 file:

• Trigger/TrigAnalysis/TrigDecisionMaker/python/TrigDecisionMakerConfig.py

Adding @tamartin as watcher

added Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash e3cec82f)

	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 31061]

CI passed, change looks fine. Approved.

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

merged

mentioned in commit a4695037

added sweep:ignore label