Rip out the update path

Confirmed that update.php detects if you are on a too-old version of Automatic Updates.

Assigning to @tedbow for final review.

I think `package_manager_update_last_removed` will also need to be removed from the core merge request..

I can do this because will need to check this by running the conversion script.

When running the conversion script for the core merge this caused 2 problems 1 phpcs and 1 phpstan.

I fixed the phpcs issue but still have this

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Running PHPStan on changed files.
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Line core/modules/package_manager/tests/src/Kernel/PackageManagerKernelTestBase.php
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94 Class Drupal\Tests\package_manager\Kernel\PackageManagerKernelTestBase has an uninitialized readonly property $fileSystem. Assign it in the constructor.
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[ERROR] Found 1 error

Not actually use about this

If test pass then looks good

Automatically closed - issue fixed for 2 weeks with no activity.