Fix binary-plugin scripted test so it can run more than once.

sbt/src/sbt-test/project/binary-plugin/changes/use/plugins.sbt

@@ -1 +1 @@
-addSbtPlugin("org.example" % "demo-plugin" % "3.4")
+addSbtPlugin("org.example" % "demo-plugin" % "3.4-SNAPSHOT")

sbt/src/sbt-test/project/binary-plugin/common.sbt

@@ -1,7 +1,7 @@
 organization in ThisBuild := "org.example"
 
-version in ThisBuild := "3.4"
+// We have to use snapshot because this is publishing to our local ivy cache instead of
+// an integration cache, so we're in danger land.
+version in ThisBuild := "3.4-SNAPSHOT"
 
-lazy val define = project
 
-lazy val use = project

sbt/src/sbt-test/project/binary-plugin/test

@@ -1,10 +1,12 @@
+# First we define the plugin project and publish it
 $ copy-file changes/define/build.sbt build.sbt
 $ copy-file changes/define/A.scala A.scala
 
 # reload implied
 > publishLocal
 
+# Now we remove the source code and define a project which uses the build.
 $ delete build.sbt A.scala
 $ copy-file changes/use/plugins.sbt project/plugins.sbt
 > reload
-> extra/check
+> check