The `queries.xml` file defines which extractor the `codeql test` runner will use
to extract databases for the tests. In the future one will be able to write this
information in `qlpack.yml`, but we can't do that immediately because the
_existing_ CodeQL tooling would refuse to parse a `qlpack.yml` that has the new
field in it.
Adding a queries.xml file means that the normalization of file names in the test
output changes even with the old QLTest, so there are a number of consequential
updates of expected output files.
A default re-export (not part of the standard yet) looks like this:
```
export f from 'mod';
```
What this means is that the default export of `mod` is re-exported under the name `f`.
Default re-export specifiers (like `f` in this example) are modelled as a kind of default export specifier in our library, but unlike normal default export specifiers they do not export the name `default`.
This was previously not modelled correctly, leading to surprising errors down the line, for example in type inference where we suddenly would no longer be able to resolve an import that otherwise looked resolvable.
