Update passwordValidator and passwordRequiredValidatorText prop

[ektaghag-eaton]

Fixes BLUI 4703

Changes proposed in this Pull Request:

• Make passwordValidator props accessible from the LoginScreen component.
• Remove passwordRequiredValidatorText from the LoginScreen component.

Screenshots / Screen Recording (if applicable)

To Test:

• Add below code snippet below in
  passwordValidator={(password: string): boolean | string => { if (password?.length > 5) { return true; } return 'Password must be at least 6 characters'; }}

• go to http://localhost:3000/login

• enter a password less than 6 characters login button will be disabled

• blur password input field will show an error message Password must be at least 6 characters

Any specific feedback you are looking for?

[github-actions]

Visit the preview URL for this PR (updated for commit f83db23):

https://blui-react-login--pr470-fix-blui-4703-access-duxbk79w.web.app

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[ektaghag-eaton]

@surajeaton , please review.