manage acls fails if it tries to add permissions to a project bot

[hugochinchilla]

Hi, I'm having issues with bot accounts created because of access tokens in a project, hurdurr fails with the following message:

$ /bin/hurrdurr -manage-acls  -config config.yaml 
level=info msg="hurrdurr Version: 0.1.6 Commit: cc9a5a250771be615b7473fd91291d10a1043dd2 Date: 2020-04-22T14:22:07+00:00"
Executing Changes:

... redacted output ...

Faile to run action: failed to add user 'project_1119_bot1' to group 'documentation': POST https://gitlab.clarity.ai/api/v4/groups/documentation/members: 400 {message: {user_id: [project bots cannot be added to other groups / projects]}}

I think the problem originates from a piece of config like this:

  product:
    developers:
      - "query: users"

I see at least 3 ways of solving the issue:

• At the query level, filter out users matching ^project_[\d+]_bot[\d*]$
• At the action level, filter out users matching the same regex
• At the client level, recognise the error project bots cannot be added to other groups / projects and trigger a non fatal error that will be logged in the console but will not cause the program to terminate inmediatly.

I want to provide a PR to fix this issue, but I want to ask for what would be your preferred style to fix this issue before starting anything.