feat: (storage) remove validation of max 2 items for data_locations in custom_placement_config field (#13261) (#21878)

[upstream:5636bb88f36bad52ba88a1c0dcf57a5070a8b526]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/13261.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+storage: lowered the minimum required items for `custom_placement_config.data_locations` from 2 to 1, and removed the Terraform-enforced maximum item limit for the field in `google_storage_bucket`
+```

google/services/storage/resource_storage_bucket.go

@@ -135,7 +135,7 @@ func ResourceStorageBucket() *schema.Resource {
 				StateFunc: func(s interface{}) string {
 					return strings.ToUpper(s.(string))
 				},
-				Description: `The Google Cloud Storage location`,
+				Description: `The Google Cloud Storage location or region.`,
 			},
 
 			"project": {
@@ -503,8 +503,7 @@ func ResourceStorageBucket() *schema.Resource {
 							Type:     schema.TypeSet,
 							Required: true,
 							ForceNew: true,
-							MaxItems: 2,
-							MinItems: 2,
+							MinItems: 1,
 							Elem: &schema.Schema{
 								Type: schema.TypeString,
 								StateFunc: func(s interface{}) string {