test: disable unused Lombok integration in JUnit fixture (#1930)

Disable the bundled Lombok agent only in the JUnit test workspace, which has no Lombok dependency, to avoid upstream JDT indexing failures.

Related: redhat-developer/vscode-java#4504

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: chagong

test/test-projects/junit/.vscode/settings.json

@@ -1,3 +1,4 @@
 {
-    "java.server.launchMode": "Standard"
+    "java.server.launchMode": "Standard",
+    "java.jdt.ls.lombokSupport.enabled": false
 }