Config: improve duplicate property check

[BrettMayson]

No description provided.

[codecov]

Codecov Report

Merging #560 (8f64c06) into main (4bb3fe8) will increase coverage by 1.8%.
Report is 9 commits behind head on main.
The diff coverage is 100.0%.

Files	Coverage Δ
libs/common/src/workspace/path.rs	85.3% <100.0%> (+3.0%)	⬆️
libs/config/src/analyze/class.rs	100.0% <100.0%> (+10.3%)	⬆️
libs/config/src/analyze/config.rs	97.6% <100.0%> (+5.5%)	⬆️

... and 27 files with indirect coverage changes