Performance fix: Update method to get groups for a user

[SathyaJayabal]

Performance fix: Update method to get groups for a user
#476

[SathyaJayabal]

verified on dev
Load time improvement:
https://docs.google.com/spreadsheets/d/1tR46uNLr0uLOEswfKvqZ1CwsBr-NAyHRB6llmehHezI/edit#gid=0
Regression testing:
https://docs.google.com/spreadsheets/d/1zHO3upydBs1dwbmdO_rhQZv9SPxKEYhE5UGpDVko7v4/edit#gid=1846865490

[SathyaJayabal]

https://topcoder.atlassian.net/browse/PLAT-236

[lakshmiathreya]

@luizrrodrigues pls link the Group gen tool to this Issue

[luizrrodrigues]

@lakshmiathreya Can you share a repo to push? (I'm can't create a new repo in topcoder-platform)

Currently pushed here: https://github.com/luizrrodrigues/groups-tool

[SathyaJayabal]

https://topcoder.atlassian.net/browse/PROD-933?focusedCommentId=17337