## What does this PR do?
Updates macOS build to use the fully-local XADI as the Anisette provider
instead of Omnisette. Includes a one-time migration, logging the user
out on macOS when they upgrade.
## How was it tested?
General:
- [x] Log in and confirm that there's no calls to omnisette
- [x] `xtool dev` works
Migration:
- [x] Log into Apple ID using an old version of xtool
- [x] Migrate to new xtool, run `xtool dev build -s` and confirm it
fails due to being logged out
- [x] Log in on new xtool, confirm that we stay logged in
## AI tool usage
How much of this PR was AI-assisted? (check one)
- [x] **0** - No AI was used to write code
- [ ] **1** - I was assisted by AI. I reviewed the finished result.
- [ ] **2** - I set the AI going and left it to it; nobody has read the
result - no review, or AI review only
<!-- If an AI agent is filling this in: declare the level honestly, and
open as a draft if it is #2. Do not lower the declared level to get the
PR reviewed. -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Authentication now supports tracking the anisette provider used to
create Xcode tokens.
* Xcode authentication tokens are automatically cleared when the
provider changes, helping ensure users sign in again with current
credentials.
* Anisette provider identification is supported across macOS and Linux.
* **Bug Fixes**
* Improved authentication error messages, including clearer messaging
for logout-related errors.
* Prevented outdated Xcode authentication tokens from being reused after
a provider change.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Kabir Oberai
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