cw-out: improved error handling

- remember error encountered in invoking write callback and always fail
afterwards without further invokes

- check behaviour in test_02_17 with

cw-out: improved error handling

- remember error encountered in invoking write callback and always fail
afterwards without further invokes

- check behaviour in test_02_17 with h2-pausing client

Reported-by: Pavel Kropachev
Fixes #13337
Closes #13340

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h2: testcase and fix for pausing h2 streams

- refs #11982 where it was noted that paused transfers may
close successfully without delivering the complete data
- made sample poc int

h2: testcase and fix for pausing h2 streams

- refs #11982 where it was noted that paused transfers may
close successfully without delivering the complete data
- made sample poc into tests/http/client/h2-pausing.c and
added test_02_27 to reproduce

Closes #11989
Fixes #11982
Reported-by: Harry Sintonen

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