feat(devbox): add provisioning_tier (flex) to LaunchParameters (alpha) (#796)

Co-authored-by: Reflex <noreply@anthropic.com>

Author: jrvb-rl

src/resources/shared.ts

@@ -284,6 +284,12 @@ export interface LaunchParameters {
    */
   network_policy_id?: string | null;
 
+  /**
+   * (Optional, Alpha) standard is default and flex is lazily provisioned and may be
+   * pre-empted. This is an alpha feature and its behavior may change without notice.
+   */
+  provisioning_tier?: 'standard' | 'flex' | null;
+
   /**
    * A list of ContainerizedService names to be started when a Devbox is created. A
    * valid ContainerizedService must be specified in Blueprint to be started.