Resource deletion leaks a watcher

[EronWright]

Problem description

The deletion logic seems to open a watcher that isn't necessarily closed.

pulumi-kubernetes/provider/pkg/await/await.go

Lines 739 to 743 in 4a5bfcc

	// Set up a watcher for the selected resource.
	watcher, err := client.Watch(c.Context, listOpts)
	if err != nil {
	return nilIfGVKDeleted(err)
	}

For resources that have a custom awaiter, the watcher appears to be leaked.

Suggestions for a fix

A simple deferred call to watcher.Stop() should suffice.

[blampe]

Fixed in #3133