Prioritize ~ channel autocomplete results based on recently viewed

Description

Repro: Type "~" in the message input area

Observed: server returns all channels on the team ordered alphabetically

Expected: Show a maximum of 20 results that match the search criteria in the following order:

A) First, show Channels that have a last_viewed_at time (with sorting by most recent first)
B) Next, show all other channels in the team (sorting alphabetical)

Note: Can this be done as a hybrid client-server approach so the local results of the users are returned immediately and then the server results are added after

QA Test Steps

None

Mana

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Assignee

Unassigned

QA Assignee

None

Reporter

Eric Sethna

Epic Link

None

Fix versions

Mattermost Team

Platform

Sprint

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QA Testing Areas

None

GitHub Issue

None

Components

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