test427: add `cookies` feature and keyword

This test doesn't work with `--disable-cookies`.

Closes https://github.com/curl/curl/pull/11320

test427: verify sending more cookies than fit in a 8190 bytes line

curl will then only populate the header with cookies that fit, dropping
ones that otherwise would have been sent

test427: verify sending more cookies than fit in a 8190 bytes line

curl will then only populate the header with cookies that fit, dropping
ones that otherwise would have been sent

Ref: https://curl.se/mail/lib-2023-06/0020.html

Closes #11303

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