Pass url through

[bigkevmcd]

Changes

Fix a bug in the sink where is not passing the URL through to the incoming requests.

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Release Notes

Add the incoming request URL to the request passed through to interceptors.

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/sink/sink.go	74.5%	75.5%	1.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/sink/sink.go	74.5%	75.5%	1.0

[dibyom]

Question: The WebhookInterceptor still won't have access to the URL right?

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dibyom

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[bigkevmcd]

Question: The WebhookInterceptor still won't have access to the URL right?

We could add it as a Request header?

[dibyom]

/lgtm