Validate transformer tutorial builds against 2.6 (#3202)

Co-authored-by: Svetlana Karslioglu <[email protected]>

Author: mikaylagawarecki

.jenkins/validate_tutorials_built.py

@@ -25,7 +25,6 @@
     "intermediate_source/mnist_train_nas",  # used by ax_multiobjective_nas_tutorial.py
     "intermediate_source/fx_conv_bn_fuser",
     "intermediate_source/_torch_export_nightly_tutorial",  # does not work on release
-    "intermediate_source/transformer_building_blocks",  # does not work on release
     "advanced_source/super_resolution_with_onnxruntime",
     "advanced_source/usb_semisup_learn", # fails with CUDA OOM error, should try on a different worker
     "prototype_source/fx_graph_mode_ptq_dynamic",