rhg: fix bugs around [use-dirstate-tracked-hint] and repo auto-upgrade

This makes two changes:
- make rhg support the [dirstate-tracked-key-v1] requirement.
I believe rhg never changes the tracked file set, so it's OK that it
doesn't have any logic for writing this file.

- fix the name of [format.use-dirstate-v2.automatic-upgrade-of-mismatching-repositories]
config option in rhg, which makes rhg actually honor the auto-upgrade.

These two issues cancelled each other out in tests (auto-upgrade was happening
because [dirstate-tracked-key-v1] forced the fallback, not because of the config),
which is I think why they went unnoticed earlier.

rust/hg-core/src/requirements.rs

@@ -84,6 +84,7 b' const SUPPORTED: &[&str] = &['
     RELATIVE_SHARED_REQUIREMENT,
     REVLOG_COMPRESSION_ZSTD,
     DIRSTATE_V2_REQUIREMENT,
+    DIRSTATE_TRACKED_HINT_V1,
     // As of this writing everything rhg does is read-only.
     // When it starts writing to the repository, it’ll need to either keep the
     // persistent nodemap up to date or remove this entry:

rust/rhg/src/main.rs

@@ -737,7 +737,7 b' const AUTO_UPGRADES: &[((&str, &str), (&'
         requirements::DIRSTATE_TRACKED_HINT_V1,
     ),
     (
-        ("use-dirstate-v2", "automatic-upgrade-of-mismatching-repositories"),
+        ("format", "use-dirstate-v2.automatic-upgrade-of-mismatching-repositories"),
         ("format", "use-dirstate-v2"),
         requirements::DIRSTATE_V2_REQUIREMENT,
     ),

tests/test-status-tracked-key.t

@@ -227,6 +227,11 b' upgrade it to dirstate-tracked-hint auto'
   $ hg debugformat -R auto-upgrade | grep tracked
   tracked-hint:       yes
 
+rhg supports this feature
+
+  $ hg status -R auto-upgrade \
+  > --config format.use-dirstate-tracked-hint=yes --config rhg.on-unsupported=abort
+
 downgrade it from dirstate-tracked-hint automatically
 
   $ hg status -R auto-upgrade \