AthenaServices: Remove ThinningOutputTool.

Remove ThinningOutputTool. Part of old thinning, it is no longer used.

This merge request affects no known packages. Consult an expert!

added master no-domain review-pending-level-1 labels

closed

CI Result SUCCESS (hash 13b17b31)

	Athena	AthSimulation	AnalysisBase	AthGeneration
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 16264]