Merge branch '15094-throttling-pushes_since_gc' into 'master'

Throttle the update of `project.pushes_since_gc` to 1 minute

## What does this MR do?

Throttle the update of `project.pushes_since_gc` to alleviate DB load

## What are the relevant issue numbers?

Relates to #15094

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- ~~[ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)~~
- ~~[ ] API support added~~
- Tests
  - ~~[ ] Added for this feature/bug~~
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)


See merge request !5083
71 jobs for master in 1112 minutes and 40 seconds (queued for 50 seconds)
Status Job ID Name Coverage
  Prepare
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knapsack

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  Test
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bundler:audit

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license_finder

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rake brakeman

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rake db:migrate:reset

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rake flog

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rubocop

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spinach 0 10

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spinach 9 10 ruby23

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teaspoon

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  Post Test
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update-knapsack

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