[mlir][Transforms] Delete 1:N dialect conversion driver (#121389)

The 1:N dialect conversion driver has been deprecated. Use the regular
dialect conversion driver instead. This commit deletes the 1:N dialect
conversion driver.

Note for LLVM integration: If you are already using the regular dialect conversion, but still have argument materializations in your code base, simply delete all `addArgumentMaterialization` calls.

For details, see
https://discourse.llvm.org/t/rfc-merging-1-1-and-1-n-dialect-conversions/82513.

mlir/tools/mlir-opt/CMakeLists.txt

@@ -40,7 +40,6 @@ if(MLIR_INCLUDE_TESTS)
     MLIRTestDialect
     MLIRTestDynDialect
     MLIRTestIR
-    MLIRTestOneToNTypeConversionPass
     MLIRTestPass
     MLIRTestReducer
     MLIRTestTransforms

mlir/tools/mlir-opt/mlir-opt.cpp

@@ -135,7 +135,6 @@ void registerTestMeshSimplificationsPass();
 void registerTestMultiBuffering();
 void registerTestNextAccessPass();
 void registerTestNVGPULowerings();
-void registerTestOneToNTypeConversionPass();
 void registerTestOpaqueLoc();
 void registerTestOpLoweringPasses();
 void registerTestPadFusion();
@@ -279,7 +278,6 @@ void registerTestPasses() {
   mlir::test::registerTestMultiBuffering();
   mlir::test::registerTestNextAccessPass();
   mlir::test::registerTestNVGPULowerings();
-  mlir::test::registerTestOneToNTypeConversionPass();
   mlir::test::registerTestOpaqueLoc();
   mlir::test::registerTestOpLoweringPasses();
   mlir::test::registerTestPadFusion();