tests: change Python code style to pass ruff checks

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

tests: fix some Python typing issues

These otherwise raise errors in pytype. A few problematic methods
weren't being used and are deleted.

pytests: scorecard upload tests

- add upload tests to scorecard, invoke with
> python3 tests/http/scorecard.py -u h1|h2|h3
- add a reverse proxy setup from Caddy to httpd for

pytests: scorecard upload tests

- add upload tests to scorecard, invoke with
> python3 tests/http/scorecard.py -u h1|h2|h3
- add a reverse proxy setup from Caddy to httpd for
upload tests since Caddy does not have other PUT/POST handling
- add caddy tests in test_08 for POST/PUT
- increase read buffer in mod_curltest for larger reads

Closes #14208

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http2: flow control and buffer improvements

- use bufq for send/receive of network data
- usd bufq for send/receive of stream data
- use HTTP/2 flow control with no-auto updates to c

http2: flow control and buffer improvements

- use bufq for send/receive of network data
- usd bufq for send/receive of stream data
- use HTTP/2 flow control with no-auto updates to control the
amount of data we are buffering for a stream
HTTP/2 stream window set to 128K after local tests, defined
code constant for now
- elminiating PAUSEing nghttp2 processing when receiving data
since a stream can now take in all DATA nghttp2 forwards

Improved scorecard and adjuste http2 stream window sizes
- scorecard improved output formatting and options default
- scorecard now also benchmarks small requests / second

Closes #10771

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tests/http: remove year ranges from copyrights

Closes #10763

tests: rename tests/tests-httpd to tests/http

- httpd is only one server we test with
- the suite coveres the HTTP protocol in general where
the default test cases need a more b

tests: rename tests/tests-httpd to tests/http

- httpd is only one server we test with
- the suite coveres the HTTP protocol in general where
the default test cases need a more beefy environment

Closes #10654

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