Add missing CF_EXPECT calls

Without them, those functions are unrepresented in stack traces.

Author: cjreynol

base/cvd/cuttlefish/host/commands/cvd/instances/instance_database.cpp

@@ -204,10 +204,10 @@ Result<bool> InstanceDatabase::RemoveInstanceGroup(
 
 Result<std::vector<LocalInstanceGroup>> InstanceDatabase::FindGroups(
     const Filter& filter) const {
-  return viewer_.WithSharedLock<std::vector<LocalInstanceGroup>>(
+  return CF_EXPECT(viewer_.WithSharedLock<std::vector<LocalInstanceGroup>>(
       [&filter](const cvd::PersistentData& data) {
         return FindGroups(data, filter);
-      });
+      }));
 }
 
 std::vector<LocalInstanceGroup> InstanceDatabase::FindGroups(

base/cvd/cuttlefish/host/commands/cvd/instances/instance_manager.cpp

@@ -102,7 +102,7 @@ InstanceManager::InstanceManager(InstanceLockFileManager& lock_manager,
 Result<std::pair<LocalInstance, LocalInstanceGroup>>
 InstanceManager::FindInstanceWithGroup(
     const InstanceDatabase::Filter& filter) const {
-  return instance_db_.FindInstanceWithGroup(filter);
+  return CF_EXPECT(instance_db_.FindInstanceWithGroup(filter));
 }
 
 Result<bool> InstanceManager::HasInstanceGroups() const {
@@ -287,7 +287,7 @@ Result<void> InstanceManager::ResetAndClearInstanceDirs() {
 
 Result<std::vector<LocalInstanceGroup>> InstanceManager::FindGroups(
     const InstanceDatabase::Filter& filter) const {
-  return instance_db_.FindGroups(filter);
+  return CF_EXPECT(instance_db_.FindGroups(filter));
 }
 
 Result<LocalInstanceGroup> InstanceManager::FindGroup(