<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves #
This PR adds the ability to skip any Fleet logic that validates on
whether or not an MDM Declaration is usable with Fleet by setting a
configuration of `FLEET_MDM_SKIP_DECLARATION_VALIDATION` to `True`. We
would like to leverage declarations such as [config
files](https://developer.apple.com/documentation/devicemanagement/servicesconfigurationfiles)
as well as other none configuration declarations that are
[restricted](https://github.com/fleetdm/fleet/blob/main/server/fleet/apple_mdm.go#L736-L738)
like
[Activations](https://developer.apple.com/documentation/devicemanagement/activationsimple),
and any declaration that requires
[AssetData](https://developer.apple.com/documentation/devicemanagement/assetdata).
We understand that these are not usable by most Fleet customers,
especially those that use Fleets cloud hosting option.
Since we run Fleet on our own infrastructure we are able to leverage our
proxy to support all additional data components needed for declarations
above.
## Testing
I've built and run Fleet locally and validated that with the
`FLEET_MDM_SKIP_DECLARATION_VALIDATION` I am able to add any
declarations I please. Without the config I am unable to add the
requested declaration types above.
- [X] Added/updated automated tests
- [X] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added experimental `mdm.allow_all_declarations` configuration option
to permit all Apple MDM declaration types when enabled, overriding
default validation checks.
* **Documentation**
* Updated configuration documentation with details for the new
experimental MDM option, including defaults, environment variables, YAML
format, and safety considerations.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Marko Lisica <83164494+marko-lisica@users.noreply.github.com>
Co-authored-by: Magnus Jensen <magnus@fleetdm.com>
