DevOps Adoption - ensure displayNamespaceId is included

What does this MR do?

This MR fixes a bug where the displayNamespaceId wasn't included in the request made to enable a group in the devops adoption feature.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

Does this MR contain changes to processing or storing of credentials or tokens, authorization and authentication methods or other items described in the security review guidelines? If not, then delete this Security section.

  • [-] 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 #334290 (closed)

Edited by Brandon Labuschagne