Fix imported script functionality in JSR-223/REPL:

- setup compilation properly to take imported scripts into account
- add compiled imported scripts into generated results
= calculate ScriptLightVirtualFile path as relative - simplifies imported scripts location

libraries/scripting/jvm-host-test/test/kotlin/script/experimental/jvmhost/test/ScriptingHostTest.kt

@@ -267,7 +267,7 @@ class ScriptingHostTest : TestCase() {
         assertTrue(res is ResultWithDiagnostics.Failure)
         val report = res.reports.find { it.message.startsWith("Source file or directory not found") }
         assertNotNull(report)
-        assertEquals("/script.kts", report?.sourcePath)
+        assertEquals("script.kts", report?.sourcePath)
     }
 
     @Test