fix: Fix unused-local-typedef issue in velox/dwio/dwrf/test/ColumnWriterTest.cpp +1 (facebookincubator#14460)

Summary:
Pull Request resolved: facebookincubator#14460

LLVM has a warning `-Wunused-local-typedef` which we are enabling to remove unused code. This has the side-effect of making it easier to do refactors should as removing unnecessary includes.

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Differential Revision: D79968264

fbshipit-source-id: e53a3cf03752a70d6bf4a310b306479e9725154f

Author: r-barnes

velox/dwio/dwrf/test/ColumnWriterTest.cpp

@@ -1504,10 +1504,6 @@ void testFlatMapWriter(
 }
 
 TEST_F(ColumnWriterTest, TestFlatMapKeyNotInAllBatches) {
-  using keyType = StringView;
-  using valueType = StringView;
-  using b = MapBuilder<keyType, valueType>;
-
   VectorMaker maker(pool_.get());
   // Test the case where not all keys appear in all batches.
   const std::vector<RowVectorPtr> batches{
@@ -1522,10 +1518,6 @@ TEST_F(ColumnWriterTest, TestFlatMapKeyNotInAllBatches) {
 }
 
 TEST_F(ColumnWriterTest, TesFlatMapDuplicatedKey) {
-  using keyType = StringView;
-  using valueType = StringView;
-  using b = MapBuilder<keyType, valueType>;
-
   const size_t size = 3;
   const BufferPtr inMaps = AlignedBuffer::allocate<bool>(size, pool_.get());
   bits::fillBits(inMaps->asMutable<uint64_t>(), 1, size, pool_.get());