test_masked_inference_wsi_dataset `temp_tissue_mask*` too large

[wyli]

Describe the bug

MONAI/tests/test_masked_inference_wsi_dataset.py

Lines 37 to 45 in da1c32a

	HEIGHT = 32914
	WIDTH = 46000
	def prepare_data():
	mask = np.zeros((HEIGHT // 2, WIDTH // 2))
	mask[100, 100] = 1
	np.save(MASK1, mask)

the synthetic examples take 9G disk space and causes issues:

it should be generated to a temp directory such as:

MONAI/tests/test_auto3dseg.py

Lines 167 to 168 in da1c32a

	self.test_dir = tempfile.TemporaryDirectory()
	work_dir = self.test_dir.name

I'll address this in #5342