Disable mirror URI column for AnVIL and add FIXME (#7154)

Author: nadove-ucsc

src/azul/plugins/metadata/anvil/__init__.py

@@ -359,7 +359,10 @@ def recurse(mapping: MetadataPlugin._FieldMapping, path: FieldPath):
         # Above, we already configured these two fields to be omitted from the
         # manifest since they are not informative to the user.
         result[('contents', 'files')]['file_url'] = 'files.azul_url'
-        result[('contents', 'files')]['file_mirror_uri'] = 'files.azul_mirror_uri'
+        # FIXME: AnVIL uses uncommon encoding for MD5 digests
+        #        https://github.com/DataBiosphere/azul/issues/7154
+        if False:
+            result[('contents', 'files')]['file_mirror_uri'] = 'files.azul_mirror_uri'
         return result
 
     primary_keys_by_table = {