[Go][Experimental] Avoid duplicated import in enum model (#6355)

* avoid double import of fmt

* update go exp petstore oas3

* import for go client exp only

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java

@@ -641,6 +641,10 @@ public abstract class AbstractGoCodegen extends DefaultCodegen implements Codege
                     }
                 }
 
+                if (this instanceof GoClientExperimentalCodegen && model.isEnum) {
+                    imports.add(createMapping("import", "fmt"));
+                }
+
                 // if oneOf contains "null" type
                 if (model.oneOf != null && !model.oneOf.isEmpty() && model.oneOf.contains("nil")) {
                     model.isNullable = true;

modules/openapi-generator/src/main/resources/go-experimental/model_enum.mustache

@@ -1,7 +1,3 @@
-import (
-	"fmt"
-)
-
 // {{{classname}}} {{#description}}{{{.}}}{{/description}}{{^description}}the model '{{{classname}}}'{{/description}}
 type {{{classname}}} {{^format}}{{dataType}}{{/format}}{{#format}}{{{format}}}{{/format}}
 

samples/client/petstore/go-experimental/go-petstore/model_enum_class.go

@@ -11,9 +11,6 @@ package petstore
 
 import (
 	"encoding/json"
-)
-
-import (
 	"fmt"
 )
 

samples/client/petstore/go-experimental/go-petstore/model_outer_enum.go

@@ -11,9 +11,6 @@ package petstore
 
 import (
 	"encoding/json"
-)
-
-import (
 	"fmt"
 )
 

samples/openapi3/client/petstore/go-experimental/go-petstore/model_enum_class.go

@@ -11,9 +11,6 @@ package petstore
 
 import (
 	"encoding/json"
-)
-
-import (
 	"fmt"
 )
 

samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_enum.go

@@ -11,9 +11,6 @@ package petstore
 
 import (
 	"encoding/json"
-)
-
-import (
 	"fmt"
 )
 

samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_enum_default_value.go

@@ -11,9 +11,6 @@ package petstore
 
 import (
 	"encoding/json"
-)
-
-import (
 	"fmt"
 )
 

samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_enum_integer.go

@@ -11,9 +11,6 @@ package petstore
 
 import (
 	"encoding/json"
-)
-
-import (
 	"fmt"
 )
 

samples/openapi3/client/petstore/go-experimental/go-petstore/model_outer_enum_integer_default_value.go

@@ -11,9 +11,6 @@ package petstore
 
 import (
 	"encoding/json"
-)
-
-import (
 	"fmt"
 )