LumiBlock: cmake cleanup, flake8, thread checker

Some cleanup of packages under LumiBlock/

• cleanup cmake configuration (mostly removing atlas_depends_on_subdirs) and update link dependencies
• enable flake8 where relevant
• enable thread checker where it passes cleanly

This merge request affects 5 packages:

• LumiBlock/LumiBlockComps
• LumiBlock/LumiBlockData
• LumiBlock/LumiBlockPers/LumiBlockAthenaPool
• LumiBlock/LumiBlockPers/LumiBlockTPCnv
• LumiBlock/LumiCalc

added DQ master review-pending-level-1 labels

CI Result FAILURE (hash 74a8016a)

	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 17763]

merged

mentioned in commit fe37a84e

added sweep:ignore label