refactor: optimize queries for galleries index page

[crnkovic]

Summary

https://app.clickup.com/t/862khr063

For composer db:dev, previously: 323 queries with 298 Eloquent models loaded in memory. After: 35 queries and 92 models loaded in memory.

Checklist

• I checked my UI changes against the design and there are no notable differences
• I checked my UI changes for any responsiveness issues
• I checked my (code) changes for obvious issues, debug statements and commented code
• I opened a corresponding card on Clickup for any remaining TODOs in my code
• I added a short description on how to test this PR (if necessary)
• I added a storybook entry for the component that was added (if necessary)
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged