Fix discovery of project file for exclude

[bishabosha]

pick the outermost project file, so that if an excluded directory is itself a scala-cli project then it is ignored.

result of the Scala Tooling Spree April 3 2025

fixes #3546

[bishabosha]

@Gedochao is there a reason that the paths aren't sorted (e.g. by outermost) before inferring the workspace? ( i guess changing that would be breaking)

[Gedochao]

@Gedochao is there a reason that the paths aren't sorted (e.g. by outermost) before inferring the workspace? ( i guess changing that would be breaking)

No reason that I know of... It should be covered with tests, in case you want to experiment.