Remove obsolete metrics/electrical.proto

The items offered here are now covered in `metrics/metric_sample.proto`.

Signed-off-by: Tiyash Basu <[email protected]>

Author: tiyash-basu-frequenz

RELEASE_NOTES.md

@@ -61,6 +61,8 @@
 
 - Added messages to support pagination in APIs.
 
+- Removed `metrics/electrical.proto`, since it is no longer needed.
+
 ## New Features
 
 <!-- Here goes the main new features and examples or instructions on how to use them -->

proto/frequenz/api/common/v1/metrics/electrical.proto

@@ -12,19 +12,6 @@ def test_package_import() -> None:
     assert v1 is not None
 
 
-def test_module_import_metrics_electrical() -> None:
-    """Test that the modules can be imported."""
-    # pylint: disable=import-outside-toplevel
-    from frequenz.api.common.v1.metrics import electrical_pb2
-
-    assert electrical_pb2 is not None
-
-    # pylint: disable=import-outside-toplevel
-    from frequenz.api.common.v1.metrics import electrical_pb2_grpc
-
-    assert electrical_pb2_grpc is not None
-
-
 def test_module_import_metrics_bounds() -> None:
     """Test that the modules can be imported."""
     # pylint: disable=import-outside-toplevel