Avoid write pom file to legacyClasspath when using additionalRuntimeClasspath (#307)

Co-authored-by: Bruno Ploumhans <[email protected]>

Author: vfyjxf

src/main/java/net/neoforged/moddevgradle/internal/WriteLegacyClasspath.java

@@ -26,6 +26,10 @@ void addEntries(Object... filesNotation) {
             // Use a provider indirection to remove task dependencies.
             // Use file names only.
             return files.getFiles().stream()
+                    // Some dependencies (such as Graal JS) can have non-jar artifacts.
+                    // Leaving them on the legacy CP will crash when SJH fails to open a filesystem for them,
+                    // so we ignore them since they would be ignored on the normal java classpath.
+                    .filter(file -> file.isDirectory() || file.getName().endsWith(".jar") || file.getName().endsWith(".zip"))
                     .map(File::getAbsolutePath)
                     .toList();
         }));