fix(ci_gen_kustomize_values): add MTU to uni07eta net-attach-def JSON

[fyanac]

Include "mtu": {{ network.mtu | default(1500) }} in the generic macvlan net-attach-def.

Assisted-By: Cursor-composer-2-fast

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https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdo/buildset/e1f749aa0e434c2798ad2a1c808d950c

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 40m 39s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 27m 58s
❌ cifmw-crc-podified-edpm-baremetal RETRY_LIMIT in 27s
❌ cifmw-crc-podified-edpm-baremetal-minor-update RETRY_LIMIT in 27s
✔️ cifmw-pod-zuul-files SUCCESS in 5m 22s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 9m 26s
✔️ cifmw-pod-k8s-snippets-source SUCCESS in 5m 18s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 49s
✔️ cifmw-architecture-validate-hci SUCCESS in 4m 47s
✔️ cifmw-molecule-ci_gen_kustomize_values SUCCESS in 5m 54s

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