rhg: use a release-mode executable in tests
This allows the rhg build for test-rhg.t to share compiled dependencies
such as hg-core with the hg-cpython build for other tests.
For context, my wrapper script for the typical edit-compile-test
cycle now looks like this:
(cd rust && cargo +nightly-2020-10-04 fmt)
(cd rust && cargo build --release -p rhg)
make --silent local PURE=--rust
python test/run-tests.py --local "$@"
Differential Revision: https://phab.mercurial-scm.org/D9728
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273ce12ad8f1` will report some style violations on a very old commit).