RN: Channel drawer button is missing accessibility label

Description

This ticket is for the React Native app:

Observed: Channel drawer button (top left of the react-native mobile app) does not have an accessibility label when using VoiceOver on iOS, or an Adroid equivalent screen reader. Button is selectable but does not read out.
Expected: When selecting the channel drawer icon, accessibility label reads "Channels and teams"

Conversation
https://community.mattermost.com/core/pl/wwyj4tij1tni9nfd8sexkn6hda

Docs: Apple iPhone Accessibility

QA Test Steps

When the channel drawer button is focused, "Channels and Teams, opens the channels and teams drawer, button" is read out.

Reporter

None

Mana

None

Assignee

Mattermost Community

QA Assignee

Lindy Isherwood

Reporter

Andrew Brown

Epic Link

Fix versions

Mattermost Team

Apps

Sprint

None

Labels

None

QA Testing Areas

Mobile - RN

Components

None
Configure