metadata: Drop unsupported key 'type'

Fix issue [1] which prevents indexer journal client from consuming the journal.

[1] https://sentry.softwareheritage.org/share/issue/1d3de3b47c234408889bff5c4f4b0d20/

Related to T4459#90001

swh/indexer/metadata.py

@@ -75,6 +75,8 @@ class ExtrinsicMetadataIndexer(
         try:
             results = []
             for item in objects.get("raw_extrinsic_metadata", []):
+                # Drop attribute 'type' (from older model versions) no longer allowed.
+                item.pop("type", None)
                 remd = RawExtrinsicMetadata.from_dict(item)
                 sentry_sdk.set_tag("swh-indexer-remd-swhid", remd.swhid())
                 results.extend(self.index(remd.id, data=remd))

[Phabricator Migration user]

Some references in the commit message have been migrated:

• T4459#90001 is now swh/infra/sysadm-environment#4459 (closed)