fix(connector): normalize non-shaded Avro collections nested inside a shaded UDT

Next layer of the testSchema shaded/non-shaded Avro tolerance. After the
top-level array/map fixes, testSchema failed at:

  assertField:857 (cast to shaded GenericData$Array)
   <- assertGenericRecords:903 (udt field)
   <- assertField:853 (yudt)

Pulsar returns a top-level UDT (yudt) as a SHADED GenericRecord, but the
collection fields nested inside it (the UDT's zlist/zset) still come back as
NON-shaded Avro arrays. normalizeToShadedAvro is a no-op on the already-shaded
record, so those nested arrays were never converted and the shaded-typed
assertion threw.

Wrap the per-field extraction in assertGenericRecords' udt/udtoptional cases
with normalizeToShadedAvro so each nested value is converted before asserting.
(Collections nested inside ysetofudt are already handled: that whole array is
deep-converted to shaded by the binary round-trip.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Madhavan

connector/src/test/java/com/datastax/oss/pulsar/source/PulsarCassandraSourceTests.java

@@ -899,15 +899,18 @@ void assertGenericRecords(String field, GenericRecord gr) {
             return;
             case "tuple":
             case "udt": {
+                // A field of this (shaded) record may itself be a non-shaded Avro collection (e.g.
+                // the UDT's zlist/zset), since Pulsar returns nested collections non-shaded even when
+                // the enclosing record is shaded. Normalize each nested value before asserting.
                 for (Field f : gr.getFields()) {
-                    assertField(f.getName(), gr.getField(f.getName()));
+                    assertField(f.getName(), normalizeToShadedAvro(gr.getField(f.getName())));
                 }
             }
             return;
             case "udtoptional": {
                 for (Field f : gr.getFields()) {
                     if (f.getName().equals("ztext")){
-                        assertField(f.getName(), gr.getField(f.getName()));
+                        assertField(f.getName(), normalizeToShadedAvro(gr.getField(f.getName())));
                     }
                     else {
                         assertNull(gr.getField(f.getName()));