CNDB-16307: respect storage compatibility mode when dispatching hints (#2176)

### What is the issue

After CNDB-16249, hints are written with the storage-compatible
messaging version (e.g., VERSION_40), but dispatch was still using the
peer's negotiated version (VERSION_DS_20). This mismatch forced hints to
be decoded and re-encoded on dispatch, which fails when the tenant is
unassigned because tables are unknown.

### What does this PR fix and why was it fixed

Cap the dispatch version to the storage compatibility mode's version so
hints can use the encoded path (no deserialization) when the versions
match.

Author: driftx

src/java/org/apache/cassandra/hints/HintsDispatchExecutor.java

@@ -36,6 +36,7 @@
 import org.apache.cassandra.io.FSReadError;
 import org.apache.cassandra.io.util.File;
 import org.apache.cassandra.locator.InetAddressAndPort;
+import org.apache.cassandra.utils.StorageCompatibilityMode;
 import org.apache.cassandra.utils.concurrent.UncheckedInterruptedException;
 import org.apache.cassandra.utils.concurrent.Future;
 
@@ -292,7 +293,12 @@ private boolean deliver(HintsDescriptor descriptor, InetAddressAndPort address)
                 return false;
             }
 
-            try (HintsDispatcher dispatcher = HintsDispatcher.create(file, rateLimiter, address, descriptor.hostId, optVersion.get(), shouldAbort))
+            // Use the minimum of peer's messaging version and storage compatibility mode's version.
+            // This ensures hints written with the storage-compatible version can be dispatched using the
+            // encoded path without deserialization, as long as the peer supports that version.
+            int dispatchVersion = Math.min(optVersion.get(), StorageCompatibilityMode.current().storageMessagingVersion());
+
+            try (HintsDispatcher dispatcher = HintsDispatcher.create(file, rateLimiter, address, descriptor.hostId, dispatchVersion, shouldAbort))
             {
                 if (offset != null)
                     dispatcher.seek(offset);