Broken dependency in scaladoc on tasty-inpector

[nicolasstucki]

The scaladoc project depends on scala3-tasty-inspector, but for some reason, some of the use cases do not include this dependency at runtime. It fails with Caused by: java.lang.ClassNotFoundException: scala.tasty.inspector.Inspector (see community-build and sbt-test/scripted). The previous version did not use the proper inspector classes either and therefore did not encounter this issue.

It is fine to have a copy of these files here for now, as it is equivalent to the current state. Someone will need to investigate and fix this issue later. I will open an issue for this.

Originally posted by @nicolasstucki in #17623 (comment)

[nicolasstucki]

To fix this issue we need to delete all files in https://github.com/lampepfl/dotty/tree/main/scaladoc/src/scala/tasty/inspector and resolve any dependency issues.