When grouping similar environments, environments aren't shown if they share the name of the "root" environment

Summary

When grouping similar environments, environments aren't shown if they share the name of the "root" environment. I'm unable to determine whether this is a gitlab-ce~3630472.

Steps to reproduce

1. Create an environment foo
2. Create another environment foo/bar
3. The environment foo is inaccessible through the UI

Example Project

https://gitlab.com/deandre-test-group/environment-test/environments

What is the current bug behavior?

The root environment can't be accessed via UI

What is the expected correct behavior?

The root environment should be accessible.

Display a "block" for the root environment in the Environments page. This block should be displayed on top of the the child, scoped environments, inside the accordion view.

Example:

• review v
  • review environment data
  • review/123 environment data
  • review/456 environment data

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com

Workaround

Environments remain accessible from https://gitlab.com/<namespace>/<project>/environments/:environment_id. Get environment_id from the API: GET /projects/:id/environments

ZD: https://gitlab.zendesk.com/agent/tickets/121437 (internal)