Note that this does not give the exact same results as the old function,
however it's not clear to me that the old results were actually correct
(it _looks_ like `read()` might be doing an IO operation, but in fact
`read` is not defined, so at best this will raise a NameError, not an
IOError).
In hindsight, having a `.getMetrics()` method that just returns `this`
is somewhat weird. It's possible that it predates the existence of the
inline cast, however.
The old Semmle duplicate-code detection code has never been done when
extracting databases for the CodeQL CLI, except that `codeql test run`
will run it _just_ in order to support tests of the feature. With the
sunsetting of Odasa there's no need to even _test_ the feature anymore.
This commit removes those tests that fail when the duplicate-code
detector is turned off. Once it is merged and bumped, we can finally
remove it from `codeql`.
