Checks that we show warning message for long cookie.

Message count: 2
VM:62 "Set-Cookie" header is ignored in response from URL: http://127.0.0.1:8000/devtools/network/resources/set-cookie.php?length=4097. The combined size of the name and value must be less than or equal to 4096 characters.
makeFetch @ VM:62
(anonymous) @ VM:1
VM:62 "Set-Cookie" header is ignored in response from URL: http://127.0.0.1:8000/devtools/network/resources/set-two-cookies.php?length=4097. The combined size of the name and value must be less than or equal to 4096 characters.
makeFetch @ VM:62
(anonymous) @ VM:1