model: Allow new status values not_found and failed to OriginVisitStatus

Related to T2961

swh/model/hypothesis_strategies.py

@@ -175,7 +175,9 @@ def origin_visit_statuses_d():
         visit=integers(1, 1000),
         origin=urls(),
         type=optional(sampled_from(["git", "svn", "pypi", "debian"])),
-        status=sampled_from(["created", "ongoing", "full", "partial"]),
+        status=sampled_from(
+            ["created", "ongoing", "full", "partial", "not_found", "failed"]
+        ),
         date=aware_datetimes(),
         snapshot=optional(sha1_git()),
         metadata=optional(metadata_dicts()),

swh/model/model.py

@@ -320,7 +320,9 @@ class OriginVisitStatus(BaseModel):
     date = attr.ib(type=datetime.datetime, validator=type_validator())
     status = attr.ib(
         type=str,
-        validator=attr.validators.in_(["created", "ongoing", "full", "partial"]),
+        validator=attr.validators.in_(
+            ["created", "ongoing", "full", "partial", "not_found", "failed"]
+        ),
     )
     snapshot = attr.ib(type=Optional[Sha1Git], validator=type_validator())
     # Type is optional be to able to use it before adding it to the database model