kubernetes: Optimize computing gloo endpoints

[davidjumani]

Description

Optimize computing gloo endpoints by using resource sets to efficiently find resources.

Code changes

Use resourceSets instead of lists find and iterate over lists of resources Since a lot of the iteration involves iterating over a list to find a NamespacedName resource, opted to use the ResourceSet to efficiently find the resource to avoid unnecessarily iterating over the same list multiple times

Context

This is a simple optimization to reduce CPU utilization https://github.com/solo-io/solo-projects/issues/7369

[solo-changelog-bot[bot]]

Issues linked to changelog: https://github.com/solo-io/solo-projects/issues/7369

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 3695c29):

https://gloo-edge--pr10478-optimize-compute-glo-8gknko0g.web.app

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