This commit renames the files relating to the diagnostic query that produces information on the number of files extracted. The files have been renamed from "SuccessfullExtractedFiles.*" to "ExtractedFiles.*". All related tests and test files have been renamed too.
The `@tags` and `@id` attributes of the queries have been left untouched, consistent with the `@tags` and `@id` for similar queries in other languages.
I had comitted a bad .expected file it seems, and since the encoding for UTF-8
is named differently from Python 2 to Python 3, we're only going to run the test
for one version.
This is basically just a port of the C++/JS queries added in:
- https://github.com/github/codeql/pull/5414 (C++)
- https://github.com/github/codeql/pull/5656 (JS)
SyntaxError should capture all errors we have information about. At least in
`python/ql/src/semmlecode.python.dbscheme` the only match for `error` is
`py_syntax_error_versioned` (which `SyntaxError` is based on).
