Add LANGUAGE param to both other fuzz demo jobs

[mpherman2]

/assign @listx

[k8s-ci-robot]

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[listx]

/lgtm

[k8s-ci-robot]

@mpherman2: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key test-infra-periodics.yaml using file config/jobs/kubernetes/test-infra/test-infra-periodics.yaml

In response to this:

/assign @listx

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