update(prow-config): Add kn-plugin CI configs

[rhuss]

i.e. CI config for the following plugins are added with this PR:

• kn-plugin-service-log
• kn-plugin-source-kamelet
• kn-plugin-migration

[rhuss]

/hold

Adding more missing plugin prow configuration so that we can do the setup in one go.

[rhuss]

/unhold

[chizhg]

/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chizhg

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• config/prod/prow/OWNERS [chizhg]

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[chizhg]

/lgtm

[rhuss]

@chizhg sorry, forgot to rebase before submitting the PR. PTAL.

[dsimansk]

/lgtm

[knative-prow-robot]

@rhuss: Updated the job-config configmap in namespace default at cluster default using the following files:

• key config.yaml using file config/prod/prow/jobs/config.yaml

Details

In response to this:

i.e. CI config for the following plugins are added with this PR:

• kn-plugin-service-log
• kn-plugin-source-kamelet
• kn-plugin-migration

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