fix(eks): helm uninstall in custom resource handler does not respect Wait (#28830)

I have a stack that installs and uninstalls helm charts, where the underlying resources use [Kubernetes Finalizers](https://kubernetes.io/docs/concepts/overview/working-with-objects/finalizers/). CDK's helm construct currently ignores `--wait`, which means that any object finalization in those helm charts is not respected in my dependency ordering.

## Compatibility

I could see some debate around whether or not this is a breaking change. I'm currently viewing it as a bug fix. I'm a bit cautious about how valuable it would be to gate this behavior compared to the additional complexity.

## Testing

Tested on a local fork and it worked like a charm

Closes #28831

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: ellistarn

packages/@aws-cdk/custom-resource-handlers/lib/aws-eks/kubectl-handler/helm/__init__.py

@@ -93,7 +93,7 @@ def helm_handler(event, context):
         helm('upgrade', release, chart, repository, values_file, namespace, version, wait, timeout, create_namespace)
     elif request_type == "Delete":
         try:
-            helm('uninstall', release, namespace=namespace, timeout=timeout)
+            helm('uninstall', release, namespace=namespace, wait=wait, timeout=timeout)
         except Exception as e:
             logger.info("delete error: %s" % e)