Add Apple BM enabled / configured flag in App Config

[mna]

1

• [ ] Add an mdm.apple_bm_configured_and_enabled boolean read-only field in the appconfig
  • this indicates whether apple business manager is configured in fleet, similar to how the existing mdm.enabled_and_configured field indicates mdm is configured (SCEP and APNs)
  • must not be possible to set this value using the PATCH app config endpoint (same as the existing enabled_and_configured)
  • document the new field in the response payload examples of the docs (GET and PATCH return the full app config)

[fleet-release]

Apple blossoms bloom, Fleet configures with ease, Clouds dance, users pleased.