fix(DockerContainer): Fix getContainerById to return undefined for non-existent containers

ts/classes.container.ts

@@ -28,13 +28,14 @@ export class DockerContainer extends DockerResource {
   /**
    * Internal: Get a container by ID
    * Public API: Use dockerHost.getContainerById(id) instead
+   * Returns undefined if container does not exist
    */
   public static async _fromId(
     dockerHostArg: DockerHost,
     containerId: string,
-  ): Promise<DockerContainer> {
-    const response = await dockerHostArg.request('GET', `/containers/${containerId}/json`);
-    return new DockerContainer(dockerHostArg, response.body);
+  ): Promise<DockerContainer | undefined> {
+    const containers = await this._list(dockerHostArg);
+    return containers.find((container) => container.Id === containerId);
   }
 
   /**