fix: Include CE attributes in sink headers

[christophd]

Changes

• Forward CloudEvent attributes to the sink
• Prevent default Camel header filter strategy removing the CE headers

/kind

Fixes knative/eventing#8724

Release Note

Docs

[knative-prow]

@christophd: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

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In response to this:

Changes

• Forward CloudEvent attributes to the sink
• Prevent default Camel header filter strategy removing the CE headers

/kind

Fixes knative/eventing#8724

Release Note

Docs

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[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow-robot]

PR needs rebase.

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