fix: Add username warning

[YashGupta2111]

Issue - #31641

This is my first PR in RocketChat

I added a feature that shows a warning if the username you type is not acceptable. This helps you know if the username you chose is okay or if you need to pick a different one

https://github.com/RocketChat/Rocket.Chat/assets/122914867/5fac8869-72b9-45d5-8d15-fe480d76829f

Steps to test or reproduce

To test, go to https://localhost:3000/admin/users/new, click on 'New User', and enter the username.

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[YashGupta2111]

We need to validate the settings to... We cannot trust blindly in the regex

UTF8_User_Names_Validation, check setUsernameWithValidation to see backend validatiosn

@hugocostadev Sir, can you clarify?

[hugocostadev]

We need to validate the settings to... We cannot trust blindly in the regex UTF8_User_Names_Validation, check setUsernameWithValidation to see backend validatiosn

@hugocostadev Sir, can you clarify?

We can't just infer that this Regex is the only pattern for usernames, there are some other settings like UTF8_User_Names_Validation ( docs here ) and Accounts_BlockedUsernameList .

Check the backend function that does that validation now, it's called setUsernameWithValidation

[YashGupta2111]

We need to validate the settings to... We cannot trust blindly in the regex UTF8_User_Names_Validation, check setUsernameWithValidation to see backend validatiosn

@hugocostadev Sir, can you clarify?

We can't just infer that this Regex is the only pattern for usernames, there are some other settings like UTF8_User_Names_Validation ( docs here ) and Accounts_BlockedUsernameList .

Check the backend function that does that validation now, it's called setUsernameWithValidation

@hugocostadev Sir, I have made some changes to the code. Could you please review them?

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