import-w3c-tests -s doesn't honor skip expectation

[Anne van Kesteren]

In LayoutTests/imported/w3c/resources/import-expectations.json we have:

    "web-platform-tests/websockets": "import",
    "web-platform-tests/websockets/stream": "skip",

However, when I run

    import-w3c-tests web-platform-tests/websockets -l -s ../../Documents/GitHub.nosync --clean-dest-dir

I get everything from the websockets/stream directory anyway.

[Radar WebKit Bug Importer]

<rdar://problem/110004053>

[Sam Sneddon [:gsnedders]]

I can't reproduce this:

```
./Tools/Scripts/import-w3c-tests --clear-dest-dir -t web-platform-tests/websockets
```

Results in:

```
% git status | grep stream
Refresh index: 100% (391489/391489), done.
```

[Sam Sneddon [:gsnedders]]

And removing `"web-platform-tests/websockets/stream": "skip"` does indeed lead it to get imported, so as far as I can tell that is working as expected.

[Sam Sneddon [:gsnedders]]

This still fails to reproduce with `--clear-dest-dir` corrected to `--clean-dest-dir` (bug 259750).

[Sam Sneddon [:gsnedders]]

So, uh, like bug 257674 this only reproduces with `-s`. Well, that's cursed. I love when the simpler codepath is broken.

[Sam Sneddon [:gsnedders]]

Currently, the skip logic in import-expectations.json is implemented in test_downloader.py, and thus is applied during the "download".

[Sam Sneddon [:gsnedders]]

Pull request: https://github.com/WebKit/WebKit/pull/16789

[EWS]

Committed 267088@main (e21f2280dbbb): <https://commits.webkit.org/267088@main>

Reviewed commits have been landed. Closing PR #16789 and removing active labels.