tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues fou

tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues found along the way.

Cherry-picked from #13489
Closes #13600

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tests: propagate errors in libtests

Use the test macros to automatically propagate some errors, and check
and log others while running the tests. This can help in debugging
exactly w

tests: propagate errors in libtests

Use the test macros to automatically propagate some errors, and check
and log others while running the tests. This can help in debugging
exactly why a test has failed.

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spelling: fix codespell 2.2.6 typos

Closes #12019

test2306: make it use a persistent connection

+ enable verbose already from the start

Closes #11621

headers: accept leading whitespaces on first response header

This is a bad header fold but since the popular browsers accept this
violation, so does curl now. Unless built with hyper.

headers: accept leading whitespaces on first response header

This is a bad header fold but since the popular browsers accept this
violation, so does curl now. Unless built with hyper.

Add test 1473 to verify and adjust test 2306.

Reported-by: junsik on github
Fixes #11605
Closes #11607

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test2306: verify getting a second response with folded headers

Reproduces the isue #11101 and verifies the fix.

Verifies a17b2a503f