Loadtest: implement User.GetPostsForChannel()

Description

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

QA Test Steps

No testing required.

Mana

Assignee

Mario de Frutos

QA Assignee

None

Reporter

Claudio Costa

Epic Link

Load Test Overhaul

Fix versions

None

Mattermost Team

Platform

Sprint

None

Labels

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QA Testing Areas

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GitHub Issue

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Components

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