[#DEV-1436] Mailing List performance improvement

Kamile Liucija Vainiuterequested to merge
feat/DEV-1436-mailint-list-perf-improvement into main

Tested locally:

for 38 teams/47 memberships: performance decrease from 23ms to 39ms

for 445 teams/9424 memberships: performance increase from 168ms to 129ms

Edited by Kamile Liucija Vainiute

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