ci: Add a job testing with rhg installed as `hg`...
ci: Add a job testing with rhg installed as `hg`
This significantly increases test coverage of rhg, without duplicating
many tests that already exist.
The `cargo build` command being remove only compiled a `rhg` executable
(as shown by the preceding `cd` command) but since a previous patch
`run-tests.py --rhg` now takes care of that.
Differential Revision:
https://phab.mercurial-scm.org/D10196