fix: CreateDeployment returns deployment_tag, not deployment_id (#1210)

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> [!IMPORTANT]
> Rename `deployment_id` to `deployment_tag` in
`CreateDeploymentResponse` to match API response in `api_client.rs`.
> 
>   - **Behavior**:
> - Rename `deployment_id` to `deployment_tag` in
`CreateDeploymentResponse` in `api_client.rs` to match API response.
>   - **Functions**:
> - `create_deployment` in `ApiClient` now correctly handles
`deployment_tag` instead of `deployment_id`.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for 05fd646. It will automatically
update as commits are pushed.</sup>

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engine/cli/src/api_client.rs

@@ -113,7 +113,7 @@ pub struct CreateDeploymentRequest {
 #[derive(Debug, Deserialize)]
 pub struct CreateDeploymentResponse {
     #[allow(dead_code)]
-    deployment_id: String,
+    deployment_tag: String,
 }
 
 impl ApiClient {