Fix FilterSpecByPathsWithoutSideEffects to handle cases without slash

[Jefftree]

The current FilterSpecByPathsWithoutSideEffects behavior is wrong for paths without a trailing slash. See comment thread for more details: https://github.com/kubernetes/kubernetes/pull/123770/files#r1516319191

cc @liggitt

[liangyuanpeng]

I agree that the safest thing to achieve the goal is to exclude exact matches on prefix and prefix+slash. The required modification looks small.

Is this something you want? If so I'll open a PR.

+++	prefixSet := sets.NewString(keepPathPrefixes...)
	for path, pathItem := range sp.Paths.Paths {
		if !prefixes.HasPrefix(path) {
			continue
		}
+++		if !strings.HasSuffix(path, "/") {
+++			continue
+++		}
+++		if !prefixSet.Has(path) {
+++			continue
+++		}
		ret.Paths.Paths[path] = pathItem
	}

[Jefftree]

From a quick glance I don't think it's correct but seems close. Here's a useful test case

FilterSpecByPathsWithoutSideEffects([]{"/apis/group/v1beta1/"}, []{"/apis/group/v1"}, ...} should return "" because despite v1 being a prefix of v1beta1, we should really be matching for "/apis/group/v1/...".

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