Remove obsolete third-party cleanup task

This task caused build failures on Windows. After some investigation,
I concluded that it is no longer needed - the existing `dependencies.exclude()`
make this transformation an identity operation. Also, there is test coverage
for missing `exclude` statements (see `:checkArtifact`), so we can't accidentally
publish a release where the problem that this code meant to address is present.

Signed-off-by: Dr. Jonathan Schulz <jonathan.schulz@tngtech.com>

Author: schulzjo-tng

archunit-junit/build.gradle

@@ -59,27 +59,8 @@ shadowJar {
     }
 }
 
-def addCleanThirdPartyTask = {
-    // These files are already relocated into archunit.jar, so they're transitively available
-    tasks.create(name: 'removeDuplicateThirdParty', type: Jar, dependsOn: shadowJar) {
-        exclude "${thirdPartyRelocationPackage.replace('.', '/')}/**"
-
-        File tempPath = tempJar(jar.archiveFile.get().getAsFile())
-        File jarPath = shadowJar.archiveFile.get().getAsFile()
-        inputs.file(jarPath)
-        from zipTree(jarPath)
-        archiveFileName = tempPath.name
-
-        doLast {
-            assert jarPath.delete()
-            assert tempPath.renameTo(jarPath)
-        }
-    }
-    finishArchive.dependsOn removeDuplicateThirdParty
-}
 ext.configureJUnitArchive = { configureDependencies ->
     return {
-        delegate.with addCleanThirdPartyTask
         compileJava.dependsOn project(':archunit-junit').finishArchive
 
         publishing{
@@ -94,6 +75,4 @@ ext.configureJUnitArchive = { configureDependencies ->
     }
 }
 
-this.with addCleanThirdPartyTask
-
 javadoc.enabled = false