[CORL-1121] Remove username validation when updated by admin (#2986)

* Use SSO validation for updateUserUsername

CORL-1121

* Remove validation on admin-only user rename

We don't need to validate the user-name as
only admin's will be using this mutator. If
they're updating things incorrectly, that's
up to them to manage with this flow.

CORL-1121

src/core/server/services/users/helpers.ts

@@ -5,7 +5,6 @@ import {
   USERNAME_MIN_LENGTH,
   USERNAME_REGEX,
 } from "coral-common/helpers/validate";
-
 import {
   EmailExceedsMaxLengthError,
   EmailInvalidFormatError,

src/core/server/services/users/users.ts

@@ -630,9 +630,6 @@ export async function updateUsernameByID(
   username: string,
   createdBy: User
 ) {
-  // Validate the username.
-  validateUsername(username);
-
   return updateUserUsername(mongo, tenant.id, userID, username, createdBy.id);
 }