Generate users optionally with Generator
Follow-up on #487 (comment 743961923)
We need to add users generation and clean up functionality to Generator to set up data for api_v4_users
. This step should be skipped by default to ensure that customer environments won't be seeded with thousands of users.
We start with 8000 users which is 90th percentile based on data #487 (comment 744000339).