Freeze Period API changes

Merged Sean Carroll requested to merge 24295-freeze-period-API-changes into master

What does this MR do?

  • Adds CRUD + Index API endpoints for new FreezePeriod model
  • Accessible only by owner or maintainer
  • Dependent on !29162 (merged)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

Availability 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

Part of #214328 (closed)

Edited by Sean Carroll