remove old scala3-staging

[Cherry-picked fb22fe4]

Author: hamzaremmal

build.sbt

@@ -19,7 +19,6 @@ val `scala3-library-bootstrapped` = Build.`scala3-library-bootstrapped`
 val `scala3-library-bootstrappedJS` = Build.`scala3-library-bootstrappedJS`
 val `scala3-sbt-bridge-bootstrapped` = Build.`scala3-sbt-bridge-bootstrapped`
 val `scala3-sbt-bridge-nonbootstrapped` = Build.`scala3-sbt-bridge-nonbootstrapped`
-val `scala3-staging` = Build.`scala3-staging`
 val `scala3-staging-new` = Build.`scala3-staging-new`
 val `scala3-tasty-inspector-new` = Build.`scala3-tasty-inspector-new`
 val `scala3-language-server` = Build.`scala3-language-server`

project/Build.scala

@@ -1046,7 +1046,6 @@ object Build {
     packageAll := {
       (`scala3-compiler` / packageAll).value ++ Seq(
         "scala3-compiler" -> (Compile / packageBin).value.getAbsolutePath,
-        "scala3-staging"  -> (LocalProject("scala3-staging") / Compile / packageBin).value.getAbsolutePath,
         "tasty-core"     -> (LocalProject("tasty-core-bootstrapped") / Compile / packageBin).value.getAbsolutePath,
       )
     },
@@ -2925,16 +2924,6 @@ object Build {
     case Bootstrapped => `tasty-core-bootstrapped`
   }
 
-  lazy val `scala3-staging` = project.in(file("staging")).
-    withCommonSettings(Bootstrapped).
-    // We want the compiler to be present in the compiler classpath when compiling this project but not
-    // when compiling a project that depends on scala3-staging (see sbt-test/sbt-dotty/quoted-example-project),
-    // but we always need it to be present on the JVM classpath at runtime.
-    dependsOn(dottyCompiler(Bootstrapped) % "provided; compile->runtime; test->test").
-    settings(
-      javaOptions := (`scala3-compiler-bootstrapped` / javaOptions).value
-    )
-
   lazy val `scala3-presentation-compiler` = project.in(file("presentation-compiler"))
     .withCommonSettings(Bootstrapped)
     .dependsOn(`scala3-compiler-bootstrapped-new`, `scala3-library-bootstrapped-new`, `scala3-presentation-compiler-testcases` % "test->test")
@@ -3927,7 +3916,7 @@ 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(`scala3-interfaces`, dottyLibrary, dottyCompiler, tastyCore).
-      bootstrappedAggregate(`scala3-language-server`, `scala3-staging`, 
+      bootstrappedAggregate(`scala3-language-server`, 
         `scala3-library-bootstrappedJS`, scaladoc, `scala3-presentation-compiler`).
       dependsOn(tastyCore).
       dependsOn(dottyCompiler).