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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test2304: remove stdout verification

This cripples the test somewhat but the check was bad since depending on
timing it could exit before the output was done, making the test flaky.

test2304: verify websocket handling when connection is closed