Add support for searching by position in user lists

Description

The user can search by full name, email (when visible), nickname and username, but not by position.

Propose adding support for searching users by position, specified in Account Settings > General > Position in the following lists:

  • Main Menu > View/Manage Members

  • Channel drop down menu > Add Members

  • Channel drop down menu > View/Manage Members

  • "More..." at the bottom of your direct message list

NOTE: Searching for users by position shouldn't work on the message autocomplete or on the search :from modifier, since it's not visible on the UI.

QA Test Steps

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Mana

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Assignee

George Goldberg

QA Assignee

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Reporter

Jason Blais

Epic Link

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Fix versions

Mattermost Team

Platform

Sprint

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GitHub Issue

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