Firefox: Posts show wrong time if resistFingerprinting is enabled

Description

GitHub issue: https://github.com/mattermost/mattermost-server/issues/8419

NOTE: There is this PR open for a time zone feature

Summary
Firefox's new setting to resist fingerprinting sets the time zone to UTC.

Steps to reproduce
In Firefox's about:config enable privacy.resistFingerprinting.
Restart the browser.
Open Mattermost and send some messages.
Expected behavior
Either times are correct or the time zone is configurable.

Observed behavior (that appears unintentional)
Times are displayed in UTC.

Possible fixes
Show a warning if the detected time zone is UTC. Add a user setting to override the time zone.

QA Test Steps

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Mana

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Assignee

Unassigned

QA Assignee

Lindy Isherwood

Reporter

Lindy Isherwood

Epic Link

None

Fix versions

Mattermost Team

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Sprint

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Labels

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QA Testing Areas

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GitHub Issue

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Components

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Severity

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