Add hardware type and linode label fields to volume struct

[zliang-akamai]

📝 Description

This is to add missing fields in Volume struct.

✔️ How to Test

Automated Testing

make fixtures ARGS="-run TestVolume"    

Manual Testing

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"

	"github.com/linode/linodego"
	"golang.org/x/oauth2"
)

func main() {
	apiKey, ok := os.LookupEnv("LINODE_TOKEN")
	if !ok {
		log.Fatal("Could not find LINODE_TOKEN, please assert it is set.")
	}
	tokenSource := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: apiKey})

	oauth2Client := &http.Client{
		Transport: &oauth2.Transport{
			Source: tokenSource,
		},
	}

	linodeClient := linodego.NewClient(oauth2Client)
	linodeClient.SetDebug(true)

	l, _ := linodeClient.CreateInstance(
		context.Background(),
		linodego.InstanceCreateOptions{
			Region: "us-mia",
			Type: "g6-nanode-1",
			Image: "linode/ubuntu24.04",
			RootPass: "unsafe-password-please-replace",
		},
	)

	
	v, _ := linodeClient.CreateVolume(
		context.Background(),
		linodego.VolumeCreateOptions{
			Label: "mytestvolume",
			Region: "us-mia",
			Size: 20,
			LinodeID: l.ID,
		},
	)

	fmt.Println(v.HardwareType, v.LinodeLabel)

	linodeClient.DeleteInstance(context.Background(), l.ID)
	linodeClient.DeleteVolume(context.Background(), v.ID)
}

[ykim-akamai]

LGTM!

[yec-akamai]

Can you update test case and fixtures?