tests: enable additional ruff Python lint options

These all seem reasonable to enable for this code.

tests: change Python code style to pass ruff checks

Most of the changes consisted of removing unused imports and unnecessary
f-strings.

connect: limit update IP info

Update IP related information at the connection and the transfer in two
places only: once the filter chain connects and when a transfer is added
to a co

connect: limit update IP info

Update IP related information at the connection and the transfer in two
places only: once the filter chain connects and when a transfer is added
to a connection. The latter only updates on reuse when the filters
already are connected.

The only user of that information before a full connect is the HAProxy
filter. Add cfilter CF_QUERY_IP_INFO query to let it find the
information from the filters "below".

This solves two issues with the previous version:
- updates where often done twice with the same info
- happy eyeballing filter "forks" could overwrite each others
updates before the full winner was determined.

Closes #14699

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http/2: simplify eos/blocked handling

- rely on the new flush to handle blocked sends. No longer
do simulated EAGAIN on (partially) blocked sends with their
need to handle repeat

http/2: simplify eos/blocked handling

- rely on the new flush to handle blocked sends. No longer
do simulated EAGAIN on (partially) blocked sends with their
need to handle repeats.
- fix some debug handling CURL_SMALLREQSEND env var
- add some assertings in request.c for affirming we do it right
- enhance assertion output in test_16 for easier analysis

Closes #14435

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h3/ngtcp2: improve error handling

- identify ngtcp2 and nghttp3 error codes that are fatal
- close quic connection on fatal errors
- refuse further filter operations once connection

h3/ngtcp2: improve error handling

- identify ngtcp2 and nghttp3 error codes that are fatal
- close quic connection on fatal errors
- refuse further filter operations once connection is closed
- confusion about the nghttp3 API. We should close the QUIC stream on
cancel and not use the nghttp3 calls intended to be invoked when the
QUIC stream was closed by the peer.

Closes #13562

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tidy-up: whitespace [ci skip]

CURLINFO_REQUEST_SIZE: fixed, add tests for transfer infos reported

- tests for 'size_request' and other stats reported, for
presence and consistency

Reported-by: Jonatan Vela

CURLINFO_REQUEST_SIZE: fixed, add tests for transfer infos reported

- tests for 'size_request' and other stats reported, for
presence and consistency

Reported-by: Jonatan Vela
Fixes #13269
Closes #13275

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