Ephemeral IPs in instance IPs list should include pool ID

[david-crespo]

Floating IPs include the pool but ephemeral IPs don't.

omicron/nexus/types/src/external_api/views.rs

Lines 465 to 506 in b0639b0

	#[derive(Debug, Clone, Deserialize, PartialEq, Serialize, JsonSchema)]
	#[serde(tag = "kind", rename_all = "snake_case")]
	pub enum ExternalIp {
	Ephemeral { ip: IpAddr },
	Floating(FloatingIp),
	}
	impl ExternalIp {
	pub fn ip(&self) -> IpAddr {
	match self {
	Self::Ephemeral { ip } => *ip,
	Self::Floating(float) => float.ip,
	}
	}
	pub fn kind(&self) -> IpKind {
	match self {
	Self::Ephemeral { .. } => IpKind::Ephemeral,
	Self::Floating(_) => IpKind::Floating,
	}
	}
	}
	/// A Floating IP is a well-known IP address which can be attached
	/// and detached from instances.
	#[derive(
	ObjectIdentity, Debug, PartialEq, Clone, Deserialize, Serialize, JsonSchema,
	)]
	#[serde(rename_all = "snake_case")]
	pub struct FloatingIp {
	#[serde(flatten)]
	pub identity: IdentityMetadata,
	/// The IP address held by this resource.
	pub ip: IpAddr,
	/// The ID of the IP pool this resource belongs to.
	pub ip_pool_id: Uuid,
	/// The project this resource exists within.
	pub project_id: Uuid,
	/// The ID of the instance that this Floating IP is attached to,
	/// if it is presently in use.
	pub instance_id: Option<Uuid>,
	}

I want to be able to show the pool here.