[Issue] Cleaned up duplicate variable assignments in the same line

[m2-assistant]

This issue is automatically created based on existing pull request: #30120: Cleaned up duplicate variable assignments in the same line

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Description (*)

Re-apply changes from #28085
This is a simple cleanup of two assignments to the same variable occurring in the same line.
Created by using the following regex:
($.*) = \1 = (with space before to exclude things like self::$loader = $loader = new \Composer\Autoload\ClassLoader(); and with space after to make sure it's an assignment and not anything else like ===)
And replacing with:
$1 = (also with space before and after to keep the formatting right)

Related Pull Requests

Fixed Issues (if relevant)

Manual testing scenarios (*)

none required

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)