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Write a linter rule for `$this` reassignment

Description

Write a linter rule for $this reassignment

Summary: Re-assigning $this is an invalid PHP construct, see https://3v4l.org/TauX9.

Test Plan: Added unit tests.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14514