Tracking: cmake cleanup (part 2)

Second batch of cmake cleanups for Tracking packages (first batch: !37369 (merged)). Most changes were done programmatically, so it should be OK as long as it compiles. The MR is split into several commits (please do NOT squash). In summary:

• remove atlas_depends_on_subdirs
• do not install component headers
• update external and library dependencies
• enable flake8 where applicable

This merge request affects 51 packages. Since this is a long list, I will not print it here.

Adding @jchapman ,@bouhova ,@amorley ,@gavrilen as watchers

added Digitization JetEtmiss Tracking master review-pending-level-1 labels

CI Result SUCCESS (hash a95d3588)

	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 22176]

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

merged

mentioned in commit 6262c425

added sweep:ignore label