Add hosts modal: explain how to enroll Linux ARM

[harrisonravazzolo]

• @noahtalerman: User requested this because they knew that Fleet supported enrolling ARM Linux hosts. When they went to the "Add hosts" modal in the Fleet UI they didn't see instructions on how to enroll these hosts.
  • @noahtalerman: In the interim the user can check for supported fleetctl package flags by running fleetctl package -h
  • @harrisonravazzolo: After we merge this PR, they can find this in the docs: Update enroll-hosts.md to include arch64 note #25518
  • @noahtalerman: Eventually Fleet could add some help text to the "Add hosts" modal to explain how to enroll ARM Linus hosts.

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User stories

• Add hosts modal: explain how to enroll Linux ARM #25546

[lucasmrod]

Related to one of my requests from a while ago: #12217.

[noahtalerman]

Updating the docu here: #25485

When building an installer for ARM based Linux, the user needs to pass the --arch=arm64 flag in fleetctl. The modal should highlight this.

The help text currently reads: Distribute your package to add hosts to Fleet. For CentOS, Red Hat, and Fedora Linux, use --type=rpm. but should include the note about architecture.

Seems to be a simple add to the PlatformWrapper.tsx but 🤷🏼‍♂️

[harrisonravazzolo]

@noahtalerman - the new PR is here #25518 sorry for the confusion!