test: Add E2E Test for 'Username Already Exists'

[Anxhul10]

Proposed changes (including videos or screenshots)

e2e.UI.validation.username.mp4

Issue(s)

closes #35489

Steps to test or reproduce

Further comments

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is missing the 'stat: QA assured' label
• This PR is missing the required milestone or project

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[MartinSchoeler]

Nice! A test contribution!

I've left some pointers to improve the PR

Thanks!

[changeset-bot]

🦋 Changeset detected

Latest commit: 6671280

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 36 packages

Name	Type
@rocket.chat/apps	Patch
@rocket.chat/meteor	Patch
@rocket.chat/core-typings	Patch
@rocket.chat/rest-typings	Patch
@rocket.chat/uikit-playground	Patch
@rocket.chat/api-client	Patch
@rocket.chat/core-services	Patch
@rocket.chat/cron	Patch
@rocket.chat/ddp-client	Patch
@rocket.chat/freeswitch	Patch
@rocket.chat/fuselage-ui-kit	Patch
@rocket.chat/gazzodown	Patch
@rocket.chat/livechat	Patch
@rocket.chat/model-typings	Patch
@rocket.chat/ui-contexts	Patch
@rocket.chat/account-service	Patch
@rocket.chat/authorization-service	Patch
@rocket.chat/ddp-streamer	Patch
@rocket.chat/omnichannel-transcript	Patch
@rocket.chat/presence-service	Patch
@rocket.chat/queue-worker	Patch
@rocket.chat/stream-hub-service	Patch
@rocket.chat/license	Patch
@rocket.chat/omnichannel-services	Patch
@rocket.chat/pdf-worker	Patch
@rocket.chat/presence	Patch
rocketchat-services	Patch
@rocket.chat/models	Patch
@rocket.chat/network-broker	Patch
@rocket.chat/mock-providers	Patch
@rocket.chat/ui-avatar	Patch
@rocket.chat/ui-client	Patch
@rocket.chat/ui-video-conf	Patch
@rocket.chat/ui-voip	Patch
@rocket.chat/web-ui-registration	Patch
@rocket.chat/instance-status	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[Anxhul10]

Nice! A test contribution!

I've left some pointers to improve the PR

Thanks!

Nice! A test contribution!

I've left some pointers to improve the PR

Thanks!

Thanks for the feedback! I've addressed the suggested changes. Could you take another look when you get a chance? Appreciate it!