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Follow up from https://github.com/discourse/discourse/pull/31559. We expect some standard headers to be added from `Rails.application.config.action_dispatch.default_headers` for responses, however these were found to be removed in some error paths. For more detail on this behaviour, refer to https://github.com/discourse/discourse/pull/31619#issuecomment-2699644232. This PR adds those headers back if they aren't there, with the caveats that we don't add headers that are irrelevant for non-HTML responses, and neither do we add X-Frame-Options which is intentionally removed for embeddables.