fix: regenerate sample FILES for CI stability

Author: yonatankarp

samples/client/petstore/kotlin-jvm-spring-4-restclient-jackson3/.openapi-generator/FILES

@@ -1,4 +1,3 @@
-.openapi-generator-ignore
 README.md
 build.gradle
 docs/ApiResponse.md
@@ -30,12 +29,3 @@ src/main/kotlin/org/openapitools/client/models/Order.kt
 src/main/kotlin/org/openapitools/client/models/Pet.kt
 src/main/kotlin/org/openapitools/client/models/Tag.kt
 src/main/kotlin/org/openapitools/client/models/User.kt
-src/test/kotlin/org/openapitools/client/apis/PetApiTest.kt
-src/test/kotlin/org/openapitools/client/apis/StoreApiTest.kt
-src/test/kotlin/org/openapitools/client/apis/UserApiTest.kt
-src/test/kotlin/org/openapitools/client/models/ApiResponseTest.kt
-src/test/kotlin/org/openapitools/client/models/CategoryTest.kt
-src/test/kotlin/org/openapitools/client/models/OrderTest.kt
-src/test/kotlin/org/openapitools/client/models/PetTest.kt
-src/test/kotlin/org/openapitools/client/models/TagTest.kt
-src/test/kotlin/org/openapitools/client/models/UserTest.kt