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