Improve error messaging on G Suite configuration page

Problem Definition

• When G Suite presents a sync. error, the error message isn't very descriptive.
  

Suggested Solution

• Include specific information regarding error conditions, e.g.

  "Resource [USER]: with email[<email_address>] already exists."
  

  "Resource [USER]: with email already exists."
  

Why this is important

• Help G Suite admins determine what the problem is and possibly identify the account which is causing the sync issue
• Help reduce contact index

Workaround

• Reach out to Atlassian Support for investigation: https://support.atlassian.com/contact/#/