feat: [WebRisk] A new method_signature parent,submission is added to method SubmitUri in service WebRiskService (#8204)

* feat: A new method_signature `parent,submission` is added to method `SubmitUri` in service `WebRiskService`
docs: A comment for message `ThreatInfo` is changed
docs: A comment for message `SubmitUriMetadata` is changed

PiperOrigin-RevId: 743172371

Source-Link: googleapis/googleapis@49235a9

Source-Link: googleapis/googleapis-gen@f01f471
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