Add PnP feature flag to bust cache

Merged Ragnar Hardarson requested to merge pnp-bust-cache into master

What does this MR do?

Closes https://gitlab.com/gitlab-org/customers-gitlab-com/-/issues/2601

No changelog as this isn't user facing.

To force propagation of updates in CustomerDot, we want to be able to bust the cache GL.com has.

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