Signed-off-by: Rémy Coutable <remy@rymai.me>

Add cop to make sure we don't use ivar in a module

See merge request gitlab-org/gitlab-ce!12800

I've followed the [upgrade guide](https://github.com/thoughtbot/factory_bot/blob/4-9-0-stable/UPGRADE_FROM_FACTORY_GIRL.md) and ran these two commands:

```
grep -e FactoryGirl **/*.rake **/*.rb -s -l | xargs sed -i "" "s|FactoryGirl|FactoryBot|"
grep -e factory_girl **/*.rake **/*.rb -s -l | xargs sed -i "" "s|factory_girl|factory_bot|"
```

Signed-off-by: Rémy Coutable <remy@rymai.me>

And use .rubocop.yml to exclude paths we don't care,
rather than using the cop itself to exclude.

* upstream/master: (1723 commits)
  Resolve "Editor icons"
  Refactor issuable destroy action
  Ignore routes matching legacy_*_redirect in route specs
  Gitlab::Git::RevList and LfsChanges use lazy popen
  Gitlab::Git::Popen can lazily hand output to a block
  Merge branch 'master-i18n' into 'master'
  Remove unique validation from external_url in Environment
  Expose `duration` in Job API entity
  Add TimeCop freeze for DST and Regular time
  Harcode project visibility
  update a changelog
  Put a condition to old migration that adds fast_forward column to MRs
  Expose project visibility as CI variable
  fix flaky tests by removing unneeded clicks and focus actions
  fix flaky test in gfm_autocomplete_spec.rb
  Use Gitlab::Git operations for repository mirroring
  Encapsulate git operations for mirroring in Gitlab::Git
  Create a Wiki Repository's raw_repository properly
  Add `Gitlab::Git::Repository#fetch` command
  Fix Gitlab::Metrics::System#real_time and #monotonic_time doc
  ...

The helper creates a fork of a project with all provided attributes,
but skipping the creation of the repository on disk.