Tests that fenced frame reporting beacons are surfaced to dev tools.
request url: https://127.0.0.1:8443/inspector-protocol/fenced-frame/resources/beacon-store.py
request headers: undefined
request data: dummy
requestExtraInfo has same requestId: true
requestExtraInfo has headers: true
requestExtraInfo referer: https://127.0.0.1:8443/
responseReceived has same requestId: true
responseReceived status: 200
loadingFinished has same requestId: true