Allow non-admin users to list, add, delete own external accounts.

Created by: artemruts

Description

Since we plan to enable to sign-ins with external accounts (GitHub/GitLab) to non-admin users, we should allow non-admin users to query their external accounts and list them under Account security page.

We also allow non-admin users to add and delete external accounts.

Right now the following query fails for non-admin users:

  query MinExternalAccounts($user: ID) {
      site {
          externalAccounts(user: $user) {
              nodes {
                  id
                  serviceID
                  serviceType
                  accountData
              }
          }
      }
  }

Error message:

{"errors":[{"message":"must be site admin","path":["site","externalAccounts"]}],"data":null}

Screenshots