`@slowTest` some slow tests (#31706)
Summary:
These are all the jit tests that take > 10 seconds according to `pytest test/test_jit.py --durations=15`
```
32.76s call test/test_jit.py::TestModels::test_super_resolution
32.20s call test/test_jit.py::TestModels::test_neural_style
30.90s call test/test_jit.py::TestJit::test_export_batchnorm
25.95s call test/test_jit.py::TestJit::test_dropout_module_requires_grad
22.24s call test/test_jit.py::TestJitGeneratedModule::test_nn_Transformer
12.38s call test/test_jit.py::TestScript::test_fuser_double_float_codegen
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/31706
Pulled By: driazati
Differential Revision: D19251567
fbshipit-source-id: 8e76f717506b8bf28d1a63ce302feb0446dc9141
