Uppercase usernames causing authentication issues

[csalas-yubico]

Describe the issue
User creating a username with a capitol letter is causing authentication issues. The MYSQL server shows that the username will maintain the uppercase username, but Keycloak is entering the username as all lowercase. Both the keycloak server and java server need to accept the username as is; or always cast to lower/upper case

To Reproduce
Steps to reproduce the behavior:

1. Create a new user with an uppercase letter in their username
2. Logout
3. Auth
4. No passkey present for the user

Expected behavior
User should be able to auth with their created username

Screenshots
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Desktop (please complete the following information):
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Additional context
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