fix: validate username before registering user

[ricardogarim]

As per CORE-544 and as discussed internally at #rocketchat-dev, creating a new user with an invalid username (containing special characters) results in an error message, but the user is still created. This leads to an error when attempting to register again using the same email, as it is already registered.

To address this issue, I introduced a new method to validate usernames before registering users, ensuring that invalid usernames prevent user creation.

https://github.com/RocketChat/Rocket.Chat/assets/9621276/c6fa6408-bde5-4cf4-9c25-701b47d9a796

---

Notes:

• We still have room to improve user registration and merge some functions that currently perform the same work. However, since the purpose of this PR is to fix the existing behavior, we'll leave other improvements for future discussions.
• There are some differences between same validation error responses that I chose not to tackle now.

ToDo:

• UI isn't rendering username errors at any type on registration.

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a56bc1907558950653bd3452fb159d755fbb1e8d

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

This PR includes changesets to release 34 packages

Name	Type
@rocket.chat/web-ui-registration	Patch
@rocket.chat/i18n	Patch
@rocket.chat/meteor	Patch
@rocket.chat/mock-providers	Patch
@rocket.chat/ui-contexts	Patch
@rocket.chat/fuselage-ui-kit	Patch
@rocket.chat/ui-client	Patch
@rocket.chat/gazzodown	Patch
@rocket.chat/livechat	Patch
@rocket.chat/ui-avatar	Patch
@rocket.chat/ui-video-conf	Patch
@rocket.chat/uikit-playground	Patch
@rocket.chat/core-typings	Patch
@rocket.chat/rest-typings	Patch
@rocket.chat/api-client	Patch
@rocket.chat/apps	Patch
@rocket.chat/core-services	Patch
@rocket.chat/cron	Patch
@rocket.chat/ddp-client	Patch
@rocket.chat/model-typings	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/instance-status	Patch

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.43%. Comparing base (1e1e849) to head (a56bc19). Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #32743   +/-   ##
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  Coverage    59.43%   59.43%           
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  Files         2546     2547    +1     
  Lines        63257    63265    +8     
  Branches     14236    14237    +1     
========================================
+ Hits         37596    37604    +8     
  Misses       22941    22941           
  Partials      2720     2720           

Flag	Coverage Δ
unit	76.04% <100.00%> (+0.01%)	:arrow_up:

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