Mobile: Filtering search by channel should also show the channel name and not only its ID

Description

This is a copy from the webapp ticket as mobile did have a similar-but-different behaviour so it should be consistent

Searching for a post filtered with `in` so it just shows the ones regarding a channel can have a confusing autocomplete if channel name has changed from its original one.

Example:searching within the "Apps Team" channel shows in auto-complete as `team-icu` which only someone who has been around long enough knows its meaning. This can make the user think the feature is broken while it’s technically functional. Show both the display name and the channel handle in autocomplete

```+ Apps Team (team-icu)```

If the string is too long to fit in the autocomplete, truncate with ellipses

QA Test Steps

None

Status

Mana

2

Assignee

Unassigned

QA Assignee

None

Reporter

Guillermo Vayá

Epic Link

None

Fix versions

Mattermost Team

Mobile

Sprint

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QA Testing Areas

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GitHub Issue

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