exclude disabled accounts from the Museum top donors and Achievement showcase pages

**blockers:**
* https://github.com/BenMakesGames/PoppySeedPetsAPI/issues/22

**to do:**
1. exclude disabled accounts from the list of top museum donators
* those accounts should no longer show up here: https://poppyseedpets.com/museum/topDonors
2. exclude disabled accounts from the list of top achievement hunters
* those accounts should no longer show up here: https://poppyseedpets.com/achievements/showcase

Resolve blocker #22 first, then trace the handlers behind /museum/topDonors and /achievements/showcase. Verify that both lists omit disabled accounts and run the relevant project checks or tests for these paths to confirm the completed behavior.

Written by the indexing model from the issue text.