Service Desk reply emails rejected when project issues set to "Only Project Members"

Merged Brett Walker requested to merge 31815-service-desk-email-rejections into master

What does this MR do?

When a project has it's issue access set to "Only Project Members" (ProjectFeature::PRIVATE), then reply emails can get rejected.

Different logic is used then handling ProjectFeature::PRIVATE, the team_access_level is checked. So we need to ensure that we return ::Gitlab::Access::GUEST privileges when it's the support_bot requesting access.

Does this MR meet the acceptance criteria?

Conformity

Performance and Testing

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 issue #31815 (closed)

Edited by Justin Farris