Use string consts for annotation key/values.

[n3wscott]

/good-first-issue

There are some constants available for both of these hardcoded strings if you want to change them.

Originally posted by @aliok in https://github.com/knative/eventing/pull/3507/files

[knative-prow-robot]

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Details

In response to this:

/good-first-issue

There are some constants available for both of these hardcoded strings if you want to change them.

Originally posted by @aliok in https://github.com/knative/eventing/pull/3507/files

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