(chocolatey#2050) Add basic unit test for new option

This commit adds a simple unit test to verify that the --ignore-pin
option appears in the OptionSet that is generated.

src/chocolatey.tests/infrastructure.app/commands/ChocolateyUpgradeCommandSpecs.cs

@@ -236,6 +236,12 @@ public void Should_add_short_version_of_skip_hooks_to_the_option_set()
             {
                 _optionSet.Contains("skiphooks").Should().BeTrue();
             }
+
+            [Fact]
+            public void Should_add_ignore_pin_to_the_option_set()
+            {
+                _optionSet.Contains("ignore-pin").Should().BeTrue();
+            }
         }
 
         public class When_handling_additional_argument_parsing : ChocolateyUpgradeCommandSpecsBase