testing: stop skipping all Python tests of Rust revlog...
testing: stop skipping all Python tests of Rust revlog
This base class was not adapted for the introduction of `InnerRevlog`,
which also stopped exposing an `Index` class from `rustext`. As a
consequence, `test-rust-ancestor.py` was always skipped (and would
have been slightly broken).
We remove the skipping conditions from `rustancestorstest`, as they
now contradict or repeat those of the base class.
Also, `LazyAncestors` objects apparently hold only one reference to
the inner revlog (they had previously two references on the Rust index).
What matters most of course is the return to `start_count` in these
tests, i.e., that there is no memory leak nor double frees.
In the Python test, we conflate the presence of the `pyo3_rustext` package
with that of `rustext`, as we do not plan to support building one and not
the other (we hope to convert fully to PyO3 soon).
The skipping is actually done by the base test class.
