TrigmuComb+TrigSiSpacePointTool: Cleanup and delete obsolete package

• delete obsolete job option files
• remove CLHEP dependency
• remove unused dependency on TrigSiSpacePointTool and delete this package (ATR-19153)
• CMake cleanup
• enable flake8 checking
• move private headers to src/

This merge request affects 2 packages:

• Trigger/TrigAlgorithms/TrigmuComb
• Trigger/TrigTools/TrigSiSpacePointTool

Adding @sutt ,@gavrilen ,@nagano as watchers

added Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash 6762e801)

	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 0
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 15917]

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

merged

mentioned in commit fca9948c

added sweep:ignore label