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* routemanager: enforce a single selected exit node
Backport of the exit-node exclusivity reconcile from the 0.75.0 line
(upstream commit 966fbec11) onto v0.74.0. Exit nodes are mutually
exclusive, but the RouteSelector stores routes with default-on semantics,
so every available exit node reported as selected at once.
Reconcile exit-node selection on each network map: keep at most one
selected -- the user's persisted pick, else whatever management marks for
auto-apply (SkipAutoApply=false), else none. Never auto-activate an exit
node the map does not request.
Carries over only the manager/routeselector logic and its test; the
desktop-only client/server changes and the BumpNetworksRevision UI-push
feature from the original commit are intentionally excluded.
* routeselector: make exit-node reconciliation atomic
enforceSingleExitNode took the RouteSelector lock three separate times
(IsDeselectAll, then DeselectRoutes, then SelectRoutes), so a concurrent
DeselectAllRoutes could interleave and be silently undone: SelectRoutes on
its deselectAll branch clears the flag and re-selects the preferred exit
node, overriding the user's "all off".
Move the whole reconciliation into a single locked RouteSelector method
(SetExclusiveExitNode) that checks deselectAll inside the critical section,
so a deselect-all either fully precedes the reconcile (left untouched) or
fully follows it (honoured). No interleaving is possible.