revert: Add back an option to enable bsp in the presentation compiler

Author: tgodzik

project/Build.scala

@@ -448,10 +448,15 @@ object Build {
     ) ++ extMap
   }
 
+  val enableBspAllProjects = sys.env.get("ENABLE_BSP_ALL_PROJECTS").map(_.toBoolean).getOrElse{
+    val enableBspAllProjectsFile = file(".enable_bsp_all_projects")
+    enableBspAllProjectsFile.exists()
+  }
+
   // Settings used when compiling dotty with a non-bootstrapped dotty
   lazy val commonBootstrappedSettings = commonDottySettings ++ Seq(
     // To enable support of scaladoc and language-server projects you need to change this to true
-    bspEnabled := false,
+    bspEnabled := enableBspAllProjects,
     (Compile / unmanagedSourceDirectories) += baseDirectory.value / "src-bootstrapped",
 
     version := dottyVersion,
@@ -2120,7 +2125,7 @@ object Build {
           mtagsSharedSources
         } (Set(mtagsSharedSourceJar)).toSeq
       }.taskValue,
-      bspEnabled := false,
+      bspEnabled := enableBspAllProjects,
     )
   }