Native Mercurial: splitting in full and hgitaly1 mode
With the full native mode being controlled by feature flags, it makes sense to provide facilities in these functional tests to use either the HGitaly1 or the fully native mode. This is done by changing the `--heptapod-hg-native` command-line argument from an activation flag to an option with two values: `hgitaly1` and `full`. Later on, we'll introduce new CI jobs for the fully native mode.
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