Remove Services count from usage ping payload.

What does this MR do?

Removes the services count attr from usage data payload.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

It was blocking the sync of usage data for GitLab.com

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/2241

I think there is a spec that tests for this field?

assigned to @rdavila

@stanhu you mean other spec apart from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11499/diffs#c4ce289536ca139b0135f68e4716e25864f7283f_53_53?

Ah, I see you got it already. Thanks. :)

assigned to @stanhu

approved this merge request

changed milestone to %9.2

enabled an automatic merge when the pipeline for 3396edce succeeds

merged

mentioned in commit e4eec191

According to https://gitlab.com/gitlab-org/gitlab-ce/blob/master/PROCESS.md#after-the-7th:

We need sign offs from:

• a release manager: @timothyandrew
• the VP of Engineering: @stanhu
• an Engineering Lead: @rymai

Picked into 9-2-stable, will go into 9.2.0-rc7.

mentioned in commit 757bc45f