No longer check the project external auth label as this would
lock the project into using it.

Add individual presence checks to prevent short circuiting from
causing an erroneous nil.

Combine merge checks into a single call as Ruby 2.6+ supports multiple
arguments to `merge`.

Most of the project templates bundled with GitLab have an empty string
set for `external_authorization_classification_label` in their
`project.json`. When imported this overrides the default label set on
the instance, causing the label to appear empty.

This change sets empty labels to nil during import, allowing the
default label to override it and be applied to the project.

No longer check the project external auth label as this would
lock the project into using it.

Add individual presence checks to prevent short circuiting from
causing an erroneous nil.

Combine merge checks into a single call as Ruby 2.6+ supports multiple
arguments to `merge`.

Bring method back that was mistakenly removed

See merge request gitlab-org/gitlab-ce!32667

- We're also improving specs to avoid this could happen again

Upgrade GraphQL gem to 1.9.11

See merge request gitlab-org/gitlab-ce!31980

- `edge_nodes` needs to get called on the object
- added `include GlobalID::Identification` in a couple places
- renamed `object` to `item` in spec due to conflict