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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http2: fix crash in handling stream weights

- Delay the priority handling until the stream has been opened.

- Add test2404 to reproduce and verify.

Weights may change "on t

http2: fix crash in handling stream weights

- Delay the priority handling until the stream has been opened.

- Add test2404 to reproduce and verify.

Weights may change "on the run", which is why there are checks in
general egress handling. These must not trigger when the stream has not
been opened yet.

Reported-by: jbgoog@users.noreply.github.com

Fixes https://github.com/curl/curl/issues/11379
Closes https://github.com/curl/curl/pull/11384

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