Improve diagnostics by returning last round dismissible errors when KSP fails.

I'm getting a few reports with the same root cause. The initial problem is a syntax error at the application level. Sometimes we find actual problems with toolchain, code generation or else. Sometimes is pure syntax problems. Ideally we want to improve diagnostics to make it easier for devs to find problems with their code.

We already implemented last round dismissible errors for KAPT and now I added a [typeCheck](https://github.com/google/ksp/pull/3195) function for KSP so we get this error details. Please let me know what you think.