[community-build] Don't set --no-server for mill projects and publish scala-library artifact (#24209)

According to mill --help --no-server is already implied by -i. Only one
of these two should be used.
Add publishing of scala-library-bootstrapped in the prepeareCommunityBuild task
Disable scas - mill 1.0 seems to not support Scala 3 snapshot versions

Author: WojciechMazur

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -74,7 +74,7 @@ final case class MillCommunityProject(
   override val docCommand = null
     // uncomment once mill is released
     // if ignoreDocs then null else s"$baseCommand.docJar"
-  override val runCommandsArgs = List("-i", "-D", s"dottyVersion=$compilerVersion", "--no-server")
+  override val runCommandsArgs = List("-i", "-D", s"dottyVersion=$compilerVersion")
 
 final case class SbtCommunityProject(
     project: String,

community-build/test/scala/dotty/communitybuild/CommunityBuildTest.scala

@@ -91,7 +91,8 @@ class CommunityBuildTestC:
   @Test def scalatestplusScalacheck = projects.scalatestplusScalacheck.run()
   @Test def scalaXml = projects.scalaXml.run()
   @Test def scalaz = projects.scalaz.run()
-  @Test def scas = projects.scas.run()
+  // mill 1.0.5 fails to build, cannot find scala-library artifact on classpath
+  // @Test def scas = projects.scas.run()
   @Test def sconfig = projects.sconfig.run()
   @Test def shapeless3 = projects.shapeless3.run()
   @Test def sourcecode = projects.sourcecode.run()

project/Build.scala

@@ -3559,6 +3559,7 @@ object Build {
         (`scala3-sbt-bridge` / publishLocal).value
         (`scala3-interfaces` / publishLocal).value
         (`tasty-core-bootstrapped` / publishLocal).value
+        (`scala-library-bootstrapped` / publishLocal).value
         (`scala3-library-bootstrapped` / publishLocal).value
         (`scala3-tasty-inspector` / publishLocal).value
         (`scaladoc` / publishLocal).value