Fix: pin tombstones_b tests to default_loader to avoid sirius_java_sdk failures

Change-Id: I5330c2d2f6aa513c60ce3f9a35ea898f84831a7f
Reviewed-on: https://review.couchbase.org/c/TAF/+/244691
Reviewed-by: <vishal.jain@couchbase.com>
Tested-by: <shivam.paliwal@couchbase.com>

Author: ShivamPaliwal1

conf/ep_engine/tombstones_b.conf

@@ -1,11 +1,11 @@
 subdoc.subdoc_xattr.XattrTests:
-    test_transitions,loadtype=regular,workload=workload_a
-    test_transitions,loadtype=regular,workload=workload_b
-    test_transitions,loadtype=regular,workload=workload_c
-    test_transitions,loadtype=regular,workload=workload_d
-    test_transitions,loadtype=regular,workload=workload_f
-    test_transitions,loadtype=regular,workload=workload_g
-    test_transitions,loadtype=regular,workload=workload_h
-    test_transitions,loadtype=regular,workload=workload_i
-    test_transitions,loadtype=regular,workload=workload_j
-    test_shadow_fragmentation,doc_size=4096,cycle_size=500000
+    test_transitions,loadtype=regular,workload=workload_a,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_b,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_c,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_d,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_f,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_g,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_h,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_i,load_docs_using=default_loader
+    test_transitions,loadtype=regular,workload=workload_j,load_docs_using=default_loader
+    test_shadow_fragmentation,doc_size=4096,cycle_size=500000,load_docs_using=default_loader