handle new protocol for host field of credentials fils (#345)

Had to make this change and merge it because data was failing to process
on ascend-test2

src/vxingest/main.py

@@ -288,7 +288,7 @@ def connect_cb(creds: dict[str, str]) -> Cluster:
     while _attempts < 3:
         try:
             cluster = Cluster(
-                f"couchbase://{creds['cb_host']}",
+                f"{creds['cb_host']}",
                 ClusterOptions(auth, timeout_options=timeout_config),  # type: ignore
             )
             break