Go CLI: fix list dataset files by dataset name (#16341)

### What problem does this PR solve?

```
RAGFlow(api/default)> list dataset 'ccc' files;
Total: 1
```

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

internal/cli/common_command.go

@@ -1583,3 +1583,17 @@ func (c *CLI) UseAdminServer(cmd *Command) (ResponseIf, error) {
 	result.Duration = 0
 	return &result, nil
 }
+
+func (c *CLI) getDatasetIDByName(datasetName string) (string, error) {
+	response, err := c.APIListDatasetsCommand(nil)
+	if err != nil {
+		return "", err
+	}
+	commonResponse := response.(*CommonResponse)
+	for _, dataset := range commonResponse.Data {
+		if dataset["name"] == datasetName {
+			return dataset["id"].(string), nil
+		}
+	}
+	return "", fmt.Errorf("dataset %s not found", datasetName)
+}