Disable ClasspathTests.unglobClasspathVerifyTest (#20551)

cc @bishabosha @Gedochao 

[test_scala2_library_tasty]
[test_windows_full]
[test_java8]

Author: hamzaremmal

compiler/test/dotty/tools/scripting/ClasspathTests.scala

@@ -77,6 +77,7 @@ class ClasspathTests:
   /*
    * verify classpath is unglobbed by MainGenericRunner.
    */
+  @Ignore
   @Test def unglobClasspathVerifyTest = {
     val testScriptName = "unglobClasspath.sc"
     val testScript = scripts("/scripting").find { _.name.matches(testScriptName) } match