Resolves#48448.
These should help with reviewing the XAR and BOM implementations:
- https://claude.ai/code/artifact/60a78c1d-2fc9-45da-9471-1517fe77adb4.
- https://claude.ai/code/artifact/1c759a32-02f7-4a41-8611-04d7358367d7.
The darwin only tests (bom_darwin_test.go) have been executed on my
workstation.
Goal is to make sure to run the tests on macOS Github runners in
https://github.com/fleetdm/fleet/issues/33371.
- [X] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] QA'd all new/changed functionality manually
## fleetd/orbit/Fleet Desktop
- [x] Verified compatibility with the latest released version of Fleet
(see [Must
rule](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/workflows/fleetd-development-and-release-strategy.md))
- [x] Verified auto-update works from the released version of component
to the new version (see [tools/tuf/test](../tools/tuf/test/README.md))
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* macOS package builds now use an internal, built-in implementation
instead of external packaging tools.
* `.pkg` installer creation no longer depends on Docker for macOS
packaging.
* **Bug Fixes**
* Improved packaging reliability by reducing platform-specific build
steps.
* Packaging test coverage was streamlined to better match the supported
build environment.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Lucas Manuel Rodriguez
ada55da5bd