fix #7718 add tasty-core-scala2 to root project

Author: bishabosha

project/Build.scala

@@ -1319,7 +1319,7 @@ object Build {
 
     // FIXME: we do not aggregate `bin` because its tests delete jars, thus breaking other tests
     def asDottyRoot(implicit mode: Mode): Project = project.withCommonSettings.
-      aggregate(`dotty-interfaces`, dottyLibrary, dottyCompiler, tastyCore, dottyDoc, `dotty-sbt-bridge`).
+      aggregate(`dotty-interfaces`, dottyLibrary, dottyCompiler, tastyCore, `tasty-core-scala2`, dottyDoc, `dotty-sbt-bridge`).
       bootstrappedAggregate(`scala-library`, `scala-compiler`, `scala-reflect`, scalap, `dotty-language-server`, `dotty-staging`).
       dependsOn(tastyCore).
       dependsOn(dottyCompiler).