Send isNavigationRequest in the route request payload

[kbond]

Request::isNavigationRequest() always returns false. It reads $this->data['isNavigationRequest'] ?? false, but serializeRequest() in bin/playwright-server.js never includes the field, so the default is all any caller ever sees.

Added it to the payload alongside resourceType, using the same defensive req.isNavigationRequest ? ... : false shape as the neighbouring properties.

Verified against a route handler on a page with a subresource: the document request now reports true and a stylesheet request reports false (both reported false before).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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