Remove cancellation check on every vector (#11843)

We recently introduced support for kNN vectors to `ExitableDirectoryReader`.
Previously, we checked for cancellation not only on sampled calls `advance`,
but on every single call to `vectorValue`. This can cause significant overhead
when a query scans many vector values (for example the case where you're doing
an exact scan and computing a vector similarity for every matching document).

This PR removes the cancellation checks on `vectorValue`, since having them on
`advance` is already enough.

lucene/core/src/java/org/apache/lucene/index/ExitableDirectoryReader.java

@@ -430,13 +430,11 @@ public class ExitableDirectoryReader extends FilterDirectoryReader {
 
       @Override
       public float[] vectorValue() throws IOException {
-        checkAndThrow();
         return in.vectorValue();
       }
 
       @Override
       public BytesRef binaryValue() throws IOException {
-        checkAndThrow();
         return in.binaryValue();
       }