Mattermost-server: [Help Wanted] [MM-14571] UI Automation: Write an automated test using `cypress` for "at-mention still triggers notification if username is not listed in words that trigger mentions"

[esethna]

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Notes: Jira ticket

Test Key: N-14571

Steps:

1. Click the hamburger main menu
2. Select "Account Settings" then select "Notifications"
3. Click “Edit” to the right of “Words that trigger mentions”
4. De-select "Your non-case sensitive username"
5. Ensure that your username does not appear in the "Other non-case sensitive words, separated by commas" box
6. Click “Save”
7. Use another account to post a message @-mentioning your username

Expected:
You receive a notification with a mention jewel on the channel and your username is highlighted.

See our end-to-end testing documentation for reference - https://developers.mattermost.com/contribute/webapp/end-to-end-tests/

[thekiiingbob]

I'd like to take this one.