R1:aea624118b70

Allow users to terminate login sessions

Summary:
This is partly a good feature, and partly should reduce false positives on HackerOne reporting things vaguely related to this.

Allow a user to terminate login sessions from the settings panel.

Test Plan:
- Terminated a session.
- Terminated all sessions.
- Tried to terminate all sessions again.
- Logged in with two browsers, terminated the other browser's session, reloaded, got kicked out.

Reviewers: btrahan

Reviewed By: btrahan

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