Perf: Optimize member list for collective with large number of members

[Koc]

📝 Summary

This PR improves FE performance for a Collectives with large number of members by adding RecycleScroller (like in other places in the app) to the members list in popup.

🎁 Also it fixes calculation of members to display on the landing page. Right now we have 3 members on initial page load. But after window resize even for 1px smaller we're recalculating members to show. With my adjustment we have same members list for more or less similar screen sizes.

🖼️ Screenshots

🏚️ Before	🏡 After

🚧 TODO

• Add limit 15 for members loading query on the landing page (as a depends on feat: add search and limit support for team members list circles#2112)

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits
• Tests (unit, integration and/or end-to-end) passing and the changes are covered with tests
• Documentation (README or documentation) has been updated or is not required

[mejo-]

Thanks again for the contribution @Koc, much appreciated. I adjusted the height CSS property to make sure the whole modal height is used.