Track accessibility state sections and unnamed services per user

Two issues from review:

* The set of printed state sections was global, so a section printed for
  one user decided the flags of another. A user with an installed list and
  no enabled section was marked enabled=False and got a LOW "installed, not
  enabled" alert. Sections are now tracked per user.

* A count-only record was added only when a user had no named component at
  all. A dump stating installedServiceCount=2 and naming one service read
  as complete. The count-only record is now added whenever the stated count
  exceeds the distinct named components for that user, and carries the
  difference in a new unnamed_service_count field. The module summary adds
  up that remainder.

tests/android/test_artifact_dumpsys_accessibility.py

@@ -35,7 +35,9 @@ class TestDumpsysAccessibilityArtifact:
 
         assert len(da.results) == 0
         da.parse(data)
-        assert len(da.results) == 1
+        # One named service, plus one count-only record: the dump states
+        # `installedServiceCount=2` and names only one component.
+        assert len(da.results) == 2
         assert da.results[0]["package_name"] == "com.malware.accessibility"
         assert da.results[0]["service_name"] == "com.malware.service.malwareservice"
         assert da.results[0]["enabled"] is True
@@ -53,9 +55,11 @@ class TestDumpsysAccessibilityArtifact:
 
         da.check_indicators()
 
-        assert len(da.alertstore.alerts) == 1
+        assert len(da.alertstore.alerts) == 2
         assert da.alertstore.alerts[0].level == AlertLevel.MEDIUM
         assert da.alertstore.alerts[0].event == da.results[0]
+        assert da.alertstore.alerts[1].level == AlertLevel.LOW
+        assert da.alertstore.alerts[1].event == da.results[1]
 
     def test_same_component_is_kept_for_each_user(self):
         da = DumpsysAccessibilityArtifact()