Loadtest: implement User.GetUsersByUsernames()

Description

User.GetUsersByUsernames() should be implemented for UserEntity.
It should call the underlying API function (client.GetUsersByUsernames) and update the UserStore accordingly.

QA Test Steps

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Status

Mana

3

Assignee

Miguel de la Cruz

QA Assignee

None

Reporter

Claudio Costa

Epic Link

Fix versions

None

Mattermost Team

Platform

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