Ci fixes

[andresailer]

BEGINRELEASENOTES

• checkOverlaps: move from DDG4 to DDCore as this does not depend on Geant4, no impact on users
• checkGeometry: move from DDG4 to DDCore as this does not depend on Geant4, no impact on users
• CI: Key4hep: set CMAKE_INSTALL_LIBDIR=lib because Qt6 sets GNUInstallDir

ENDRELEASENOTES

[github-actions]

Test Results

   14 files     14 suites   5h 50m 52s ⏱️
  366 tests   365 ✅ 0 💤 1 ❌
2 517 runs  2 516 ✅ 0 💤 1 ❌

For more details on these failures, see this check.

Results for commit bba03cf.

[andresailer]

Alright, down to one CAD Duck test error, which seems to come from a new version of assimp in key4hep.