Add confirmation input when disabling Apple MDM to prevent accidental changes

[kilo-code-bot]

Goal

User story
As an IT admin,
I want to have to input server URL before turning Apple MDM off
so that I don't mistakenly turn off MDM for the wrong Fleet instance.

For help creating a user story, see "Writing a good user story" in the website handbook.

Change

• Apple MDM: require server URL confirmation before turning off #48595

Context

• Slack thread: https://fleetdm.slack.com/archives/C071NNMSP2R/p1773926649080909

[melpike]

Hey @marko-lisica are you still working on this one?

[marko-lisica]

Hey @melpike, I didn't have time to work on this one. If you could take it, that would be great

Context: Some time ago, Gabe accidentally turned off Apple MDM because he was in the wrong tab. He thought he was editing his local Fleet instance.