[neutron_adoption] Fix JSON serialization for ml2 baremetal patch

[rebtoor]

The ironic_ml2_baremetal_patch variable is a YAML dict, not a string. Without the to_json filter, Ansible renders it as a Python repr with single quotes, which oc patch rejects as invalid JSON. This breaks adoption jobs that include ironic (e.g. uni04delta-ipv6).

e.g.

TASK [neutron_adoption : Patch neutron ml2MechanismDrivers to inlcude ml2 baremetal] ***
fatal: [localhost]: FAILED! => {"changed": true, "cmd": "set -euxo pipefail\n\n\noc patch openstackcontrolplane openstack --type=merge --patch '{'spec': {'neutron': {'template': {'ml2MechanismDrivers': ['ovn', 'baremetal']}}}}'\n", "delta": "0:00:00.165346", "end": "2026-05-12 03:16:53.552724", "msg": "non-zero return code", "rc": 1, "start": "2026-05-12 03:16:53.387378", "stderr": "+ oc patch openstackcontrolplane openstack --type=merge --patch '{spec: {neutron: {template: {ml2MechanismDrivers: [ovn, baremetal]}}}}'\nError from server (BadRequest): error decoding patch: invalid character 's' looking for beginning of object key string", "stderr_lines": ["+ oc patch openstackcontrolplane openstack --type=merge --patch '{spec: {neutron: {template: {ml2MechanismDrivers: [ovn, baremetal]}}}}'", "Error from server (BadRequest): error decoding patch: invalid character 's' looking for beginning of object key string"], "stdout": "", "stdout_lines": []}

Co-Authored-By: Cursor (claude-sonnet-4-20250514)

[openshift-ci]

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[ciecierski]

@rebtoor This is duplicate to change #1381

[rebtoor]

argh, sorry @ciecierski , didn't see that. I'm closing this one than.