Add Playwright Tests for "Create User," "Invite User," and "Create Group" Flows

[Annaseli]

Add a Playwright test for the "Create User", "Invite User", and "Create Group" functionalities in the UI to validate their flow.

Flow for "Create User":

Administration -> Users -> Create API User

Flow for "Invite User":

Administration -> Users -> Invite User

Flow for "Create Group":

Administration -> Groups -> Create Group