🎨 [Frontend] Enh: users are identified by username

[odeimaiz]

What do these changes do?

• userName is the new (visual) unique identifier for users
  • If you want to add a new user to an organization, this is now done by typing their userName instead of email
  • The email still can be used if the user to be added doesn't hide their email in the Privacy settings
• first_name, last_name and email are optional for known-users.
• Fix current master, by casting the group_ids and user_ids to integers.

Related issue/s

• follows ✨♻️ webserver: refactored groups plugin and new user privacy compliance #6917
• related to Share resources typing the email address osparc-issues#1779

How to test

Dev-ops checklist

• No ENV changes or I properly updated ENV (read the instruction)

[GitHK]

👍

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[pcrespov]

No need for casting uid and gids from #6939. Not sure whether now the front-end will break if the value is already int

[odeimaiz]

No need for casting uid and gids from #6939. Not sure whether now the front-end will break if the value is already int

Nope, it will just keep the int, np.