CMake cleanup of TrigEgamma analysis packages

Some cleanup of the CMake configuration of the TrigEgamma analysis packages. Mainly removing atlas_depends_on_subdirs and enable flake8 where relevant.

This merge request affects 3 packages:

• Trigger/TrigAnalysis/TrigEgammaAnalysisTools
• Trigger/TrigAnalysis/TrigEgammaEmulationTool
• Trigger/TrigAnalysis/TrigEgammaMatchingTool

added Egamma Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash 3063907e)

	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 15639]

The changes look ok. Adding review-approved label.

L1 shifter

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

merged

mentioned in commit f87ceed5

added sweep:ignore label