[SPARK-40796][BUILD][FOLLOW-UP] Fix Mypy check on unused "type: ignore"

### What changes were proposed in this pull request?

The mypy check in master seems to be broken:

<img width="676" alt="Screen Shot 2022-10-17 at 1 09 13 PM" src="https://user-images.githubusercontent.com/1938382/196273759-64372862-6caa-4a9e-b700-b665c7ff7e6c.png">

(see it on apache#38279 and apache#38275, also reproducible locally).

This PR propose to remove the relevant `type: ignore` comments.

### Why are the changes needed?

Fix python lint check.

### Does this PR introduce _any_ user-facing change?

No

### How was this patch tested?

UT

Closes apache#38287 from amaliujia/test_python_lint.

Authored-by: Rui Wang <rui.wang@databricks.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>

python/pyspark/sql/connect/plan.py

@@ -322,15 +322,11 @@ def _convert_measure(
     ) -> proto.Aggregate.AggregateFunction:
         exp, fun = m
         measure = proto.Aggregate.AggregateFunction()
-        measure.function.name = fun  # type: ignore[attr-defined]
+        measure.name = fun
         if type(exp) is str:
-            measure.function.arguments.append(  # type: ignore[attr-defined]
-                self.unresolved_attr(exp)
-            )
+            measure.arguments.append(self.unresolved_attr(exp))
         else:
-            measure.function.arguments.append(  # type: ignore[attr-defined]
-                cast(Expression, exp).to_plan(session)
-            )
+            measure.arguments.append(cast(Expression, exp).to_plan(session))
         return measure
 
     def plan(self, session: Optional["RemoteSparkSession"]) -> proto.Relation:
@@ -339,13 +335,11 @@ def plan(self, session: Optional["RemoteSparkSession"]) -> proto.Relation:
 
         agg = proto.Relation()
         agg.aggregate.input.CopyFrom(self._child.plan(session))
-        agg.aggregate.measures.extend(  # type: ignore[attr-defined]
+        agg.aggregate.result_expressions.extend(
             list(map(lambda x: self._convert_measure(x, session), self.measures))
         )
 
-        gs = proto.Aggregate.GroupingSet()  # type: ignore[attr-defined]
-        gs.aggregate_expressions.extend(groupings)
-        agg.aggregate.grouping_sets.append(gs)  # type: ignore[attr-defined]
+        agg.aggregate.grouping_expressions.extend(groupings)
         return agg
 
     def print(self, indent: int = 0) -> str: