- find accounts (user DNs) that have been removed; any active STS credentials or MinIO service accounts belonging to these users are purged.

- find accounts whose group memberships have changed; access policies available to a credential are updated to reflect the change, i.e. they will lose any privileges associated with a group they are removed from, and gain any privileges associated with a group they are added to.

  // uid contains the uid of the user that created the CertificateSigningRequest.
  // Populated by the API server on creation and immutable.
  // +optional
  optional string uid = 3;

  // groups contains group membership of the user that created the CertificateSigningRequest.
  // Populated by the API server on creation and immutable.
  // +listType=atomic
  // +optional
  repeated string groups = 4;