Add checkfile for ScalaCheck (#20388)

[test_scala2_library_tasty]

Closes #20374

Author: hamzaremmal

tests/init-global/warn/ScalaCheck.check

@@ -0,0 +1,10 @@
+-- Warning: tests/init-global/warn/ScalaCheck.scala:16:9 ---------------------------------------------------------------
+16 |  object OptMinSuccess extends IntOpt:  // warn
+   |         ^
+   |       Cyclic initialization: object OptMinSuccess -> object FirstParser -> object OptMinSuccess. Calling trace:
+   |       ├── object OptMinSuccess extends IntOpt:  // warn	[ ScalaCheck.scala:16 ]
+   |       │   ^
+   |       ├── object FirstParser extends CmdLineParser:	[ ScalaCheck.scala:15 ]
+   |       │   ^
+   |       └── val opts = Some(OptMinSuccess)	[ ScalaCheck.scala:21 ]
+   |                           ^^^^^^^^^^^^^

tests/init-global/warn/ScalaCheck.scala

@@ -18,5 +18,5 @@ object FirstParser extends CmdLineParser:
     val names = Set("bla")
     val help = "bla"
 
-  val opts = List(OptMinSuccess)
+  val opts = Some(OptMinSuccess)
   val a = "FirstParser"