CLI: Implement auth logout command

[fredrikekelund]

Related issues

• Fixes STU-947

Proposed Changes

This PR is based on @youknowriad's work in #1958. It implements a studio auth logout command that:

1. Calls a REST API endpoint to revoke the access token
2. Clears the access token from the appdata file

Testing Instructions

1. Open Studio
2. Ensure you are logged out
3. Run npm run cli:build
4. Run node dist/cli/main.js auth logout
5. Ensure that an "Already logged out" message is printed
6. Log in to WordPress.com through Studio
7. Run node dist/cli/main.js auth logout
8. Ensure that a "Successfully logged out" message is printed
9. Reload Studio
10. Ensure that you are logged out in Studio, too

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[github-actions]

📊 Performance Test Results

Comparing 9a1327a vs trunk

site-editor

Metric	trunk	9a1327a	Diff	Change
load	11735.00 ms	8604.00 ms	-3131.00 ms	🟢 -26.7%

site-startup

Metric	trunk	9a1327a	Diff	Change
siteCreation	12044.00 ms	12097.00 ms	+53.00 ms	🔴 0.4%
siteStartup	3976.00 ms	3947.00 ms	-29.00 ms	🟢 -0.7%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change

[gcsecsey]

Thanks @fredrikekelund, this looks good to me and works well. 👍

The command's output is as described:

Logged in	Logged out

When switching back to Studio, I'm also logged out:

The new tests are also all green: