DevOps Adoption: load groups in app

What does this MR do?

This MR loads the groups into the DevOps Adoption tab, as they are needed for the task of creating segments in a modal. See the issue here for more information: #271247 (closed).

The groups API is REST only and the remaining part of this feature will be using GraphQL. Since the ambition is to use this segment creation elsewhere we want to keep everything in GraphQL so it can easily be moved to and used in other parts of the application.

To achieve this, we use a local resolver (and not a local-only field since this is async behavior, see more in this ticket: #280832 (closed)).

Screenshots (strongly suggested)

N/A since this is a functional change only.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Related to #271247 (closed), #28960, #280832 (closed)