Add version metadata to release config map

For the image mapper config map, it would be nice to have some metadata

```yaml
apiVersion: v1
kind: ConfigMap
metadata:
...
labels:
app.kubernetes.io/version: "SHA"
annotations:
knative.dev/example-checksum: "123456"
```

this would be similar to other resource.

Inspect the image mapper release ConfigMap and compare its metadata with the other resource referenced in the issue. Add the version label and checksum annotation shown in the example, then verify that the rendered ConfigMap contains the expected metadata.

Written by the indexing model from the issue text.