Move some travis tests to github workflow, remove redundant c# test (#13704)

* move some travis tests to github workflow, remove reduntant c# test

* setup ruby

* switch to setup-ruby

* bundle install

* remove bash

* remove bundle install

* remmvoe gemfile

* add more folders in tab detection

* comment out java folder in tab detection

* undo changes in tab detection

samples/client/petstore/csharp-netcore/OpenAPIClient-net47/src/Org.OpenAPITools.Test/Model/CatTests.cs

@@ -51,9 +51,8 @@ namespace Org.OpenAPITools.Test.Model
         [Fact]
         public void CatInstanceTest()
         {
-            // test to ensure both Cat and Animal (parent) can have "AdditionalProperties", which result in warnings
-            Cat c = JsonConvert.DeserializeObject<Cat>("{\"className\":\"cat\",\"bar\":\"from json bar\"}");
-            Assert.Equal("from json bar", c.AdditionalProperties["bar"]);
+            // TODO uncomment below to test "IsType" Cat
+            //Assert.IsType<Cat>(instance);
         }