fix: expensive sorting of token list.

[pantierra]

Every request to the API needs to check "is this person's login token still valid?" To avoid asking that question over and over, the server keeps a cache with up to 50,000 answers.

Once that notebook is full, it needs to erase old answers to make room for new ones. For this, it flips through and re-sort the entire cache just to find the one answer to erase. Every single time.

Instead of "sort everything, then grab the one you need," let's use a heap stack. That should be more performant.

[wrynearson]

@thenav56 if you're still around, could you review and merge (to staging)?

[thenav56]

Argocd is green.

The configmap didn't recreated the stac-auth pod, for now terminated the existing pod to use the latest changes.

Applied to both staging and production.