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
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}