AtlasTest+Tools: enable flake8

Enable falke8 for relevant packages under AtlasTest and Tools.

This merge request affects 7 packages:

• AtlasTest/ControlTest
• AtlasTest/PyAthenaTests
• AtlasTest/TestTools
• Tools/AthDataQuality
• Tools/PROCTools
• Tools/PathResolver
• Tools/Tier0ChainTests

Adding @amete as watcher

added Test Tools master review-pending-level-1 labels

CI Result SUCCESS (hash 8388250d)

	Athena	AthSimulation	AthGeneration	AnalysisBase
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 22407]

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

merged

mentioned in commit e294c83f

added sweep:ignore label