WS-1893 curator workflow

This makes a new workflow and capability to run curator. It also adds a form to the WS homepage to submit a curator capability request.

It'll probably require some tweaking, but it ran locally to the point where it created a workflow request. Beyond that it'll depend on !1473 (closed) to have curator callable within ingest_envoy.

shared/workspaces/alembic/versions/5939146da7bb_add_curator_capability.py

@@ -21,8 +21,8 @@ wf_name = "curator"
 def upgrade():
     op.execute(
         f"""
-        INSERT INTO capabilities (capability_name, max_jobs)
-        VALUES (E'{wf_name}', 10)
+        INSERT INTO capabilities (capability_name, max_jobs, single_version_only)
+        VALUES (E'{wf_name}', 10, true)
         """
     )