revert changes by mistake OpenAPITools#2

Author: kuFEAR

.github/.test/samples.json

@@ -686,24 +686,6 @@
         "Client: Kotlin"
       ]
     },
-    {
-      "input": "kotlin-client-petstore-retrofit2-coroutines.sh",
-      "matches": [
-        "Client: Kotlin"
-      ]
-    },
-    {
-      "input": "kotlin-client-petstore-retrofit2-rx.sh",
-      "matches": [
-        "Client: Kotlin"
-      ]
-    },
-    {
-      "input": "kotlin-client-petstore-retrofit2-rx2.sh",
-      "matches": [
-        "Client: Kotlin"
-      ]
-    },
     {
       "input": "kotlin-client-string.sh",
       "matches": [