📬 refactor: Normalize Email Handling in User Methods (#10743)

- Updated the `findUser` method to normalize email fields to lowercase and trimmed whitespace for case-insensitive matching.
- Enhanced the `normalizeEmailInCriteria` function to handle email normalization in search criteria, including `` conditions.
- Added tests to ensure email normalization works correctly across various scenarios, including case differences and whitespace handling.

api/server/services/PermissionService.js

@@ -292,7 +292,7 @@ const ensurePrincipalExists = async function (principal) {
     let existingUser = await findUser({ idOnTheSource: principal.idOnTheSource });
 
     if (!existingUser) {
-      existingUser = await findUser({ email: principal.email.toLowerCase() });
+      existingUser = await findUser({ email: principal.email });
     }
 
     if (existingUser) {

api/strategies/socialLogin.test.js

@@ -172,6 +172,7 @@ describe('socialLogin', () => {
 
       /** Verify both searches happened */
       expect(findUser).toHaveBeenNthCalledWith(1, { googleId: googleId });
+      /** Email passed as-is; findUser implementation handles case normalization */
       expect(findUser).toHaveBeenNthCalledWith(2, { email: email });
       expect(findUser).toHaveBeenCalledTimes(2);