REGTESTS: ssl: also verify that 0-rtt properly advertises early-data:1

REGTESTS: ssl: also verify that 0-rtt properly advertises early-data:1

This patch completes the 0-rtt test to verify that early-data:1 is
properly emitted to the server in the relevant situations. We carefully
compare it with the expected values that are computed based on the TLS
version, the client and listener's support for 0-rtt and the resumption
status. A response header "x-early-data-test" is set to OK on success,
or KO on failure and the client tests this. The previous test is kept
as well. This was tested with quictls-1.1.1 and quictls-3.0.1 for TCP,
as well as aws-lc for QUIC.