Auto merge of #23174 - soniasingla:DefaultPaths, r=jdm
Auto merge of #23174 - soniasingla:DefaultPaths, r=jdm

Add default paths for WPT tests

Set the following default configs for WPT tests.
```--ca-cert-path=tests\wpt\web-platform-tests\tools\certs\cacert.pem
--host-key-path=tests\wpt\web-platform-tests\tools\certs\web-platform.test.key
--host-cert-path=tests\wpt\web-platform-tests\tools\certs\web-platform.test.pem
--ssl-type=pregenerated
```
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #23133

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