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This PR removes multiple unneeded fields from the `HookTask` struct and adds the two headers `X-Hub-Signature` and `X-Hub-Signature-256`. ## ⚠️ BREAKING ⚠️ * The `Secret` field is no longer passed as part of the payload. * "Breaking" change (or fix?): The webhook history shows the real called url and not the url registered in the webhook (`deliver.go`@129). Close #16115 Fixes #7788 Fixes #11755 Co-authored-by: zeripath <art27@cantab.net>