tests: sync feature names with `curl -V`

Some feature names used in tests had minor differences compared to
the well-known ones from `curl -V`. This patch syncs them to make test
res

tests: sync feature names with `curl -V`

Some feature names used in tests had minor differences compared to
the well-known ones from `curl -V`. This patch syncs them to make test
results easier to grok.

Closes #14183

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test2307: fix expected failure code after ws refactoring

Fixes #12722
Closes #12728

websockets: check for negative payload lengths

- in en- and decoding, check the websocket frame payload lengths for
negative values (from curl_off_t) and error the operation in that ca

websockets: check for negative payload lengths

- in en- and decoding, check the websocket frame payload lengths for
negative values (from curl_off_t) and error the operation in that case
- add test 2307 to verify

Closes #12707

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