Remove redundant parentheses tests

rubocop/rubocop#11739 updated `Style/RedundantParentheses` to detect
this, so we can now consider it out of scope of these cops, as was done
in https://github.com/rubocop/rubocop-minitest/pull/248/files#r1150046949.

test/rubocop/cop/minitest/assert_respond_to_test.rb

@@ -85,25 +85,6 @@ def test_do_something
     RUBY
   end
 
-  def test_registers_offense_when_using_assert_with_respond_to_in_redundant_parentheses
-    assert_offense(<<~RUBY)
-      class FooTest < Minitest::Test
-        def test_do_something
-          assert((object.respond_to?(:do_something)))
-          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer using `assert_respond_to(object, :do_something)`.
-        end
-      end
-    RUBY
-
-    assert_correction(<<~RUBY)
-      class FooTest < Minitest::Test
-        def test_do_something
-          assert_respond_to((object, :do_something))
-        end
-      end
-    RUBY
-  end
-
   def test_does_not_register_offense_when_using_assert_respond_to
     assert_no_offenses(<<~RUBY)
       class FooTest < Minitest::Test

test/rubocop/cop/minitest/refute_respond_to_test.rb

@@ -85,25 +85,6 @@ def test_do_something
     RUBY
   end
 
-  def test_registers_offense_when_using_refute_with_respond_to_in_redundant_parentheses
-    assert_offense(<<~RUBY)
-      class FooTest < Minitest::Test
-        def test_do_something
-          refute((object.respond_to?(:do_something)))
-          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer using `refute_respond_to(object, :do_something)`.
-        end
-      end
-    RUBY
-
-    assert_correction(<<~RUBY)
-      class FooTest < Minitest::Test
-        def test_do_something
-          refute_respond_to((object, :do_something))
-        end
-      end
-    RUBY
-  end
-
   def test_does_not_register_offense_when_using_assert_respond_to
     assert_no_offenses(<<~RUBY)
       class FooTest < Minitest::Test