iOS Accessibility: Channel drawer button is missing accessibility label for VoiceOver

Description

Observed: Channel drawer button (top left of the react-native mobile app) does not have an accessibility label when using VoiceOver on iOS. 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

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Status

Mana

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Assignee

Unassigned

QA Assignee

None

Reporter

Andrew Brown

Epic Link

Fix versions

Mattermost Team

Apps

Sprint

None

Labels

QA Testing Areas

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GitHub Issue

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