Fix ZHA device diagnostics error for unknown unsupported attributes (#101239)

* Modify test to account for scenario of unknown unsupported attributes

* Add error checking for finding unsupported attributes

* Change comment to clarify zigpy misses an attribute def

This should make it more clear that it's about an unknown attribute (where zigpy doesn't have an attribute definition).

* Increase test coverage

This increases test coverage by doing the following:
- adding the `IasZone` to our test device, so we have a cluster which actually has some attribute definitions
- adding not just an unknown unsupported attribute by id, but also by name
- adding a known unsupported attribute by id and by name

* Fix diagnostics logic

tests/components/zha/test_diagnostics.py

@@ -44,7 +44,7 @@ def zigpy_device(zigpy_device_mock):
     """Device tracker zigpy device."""
     endpoints = {
         1: {
-            SIG_EP_INPUT: [security.IasAce.cluster_id],
+            SIG_EP_INPUT: [security.IasAce.cluster_id, security.IasZone.cluster_id],
             SIG_EP_OUTPUT: [],
             SIG_EP_TYPE: zha.DeviceType.IAS_ANCILLARY_CONTROL,
             SIG_EP_PROFILE: zha.PROFILE_ID,
@@ -93,6 +93,22 @@ async def test_diagnostics_for_device(
 ) -> None:
     """Test diagnostics for device."""
     zha_device: ZHADevice = await zha_device_joined(zigpy_device)
+
+    # add unknown unsupported attribute with id and name
+    zha_device.device.endpoints[1].in_clusters[
+        security.IasAce.cluster_id
+    ].unsupported_attributes.update({0x1000, "unknown_attribute_name"})
+
+    # add known unsupported attributes with id and name
+    zha_device.device.endpoints[1].in_clusters[
+        security.IasZone.cluster_id
+    ].unsupported_attributes.update(
+        {
+            security.IasZone.AttributeDefs.num_zone_sensitivity_levels_supported.id,
+            security.IasZone.AttributeDefs.current_zone_sensitivity_level.name,
+        }
+    )
+
     dev_reg = async_get(hass)
     device = dev_reg.async_get_device(identifiers={("zha", str(zha_device.ieee))})
     assert device