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PHPStan fixes

Max Pogonowskirequested to merge
issue/token_filter-3487368:3487368-phpstan-error-unknown into 2.x
  • CKEditor4To5UpgradePluginInterface no longer exists in core so let's stop implementing it, leaving the plugin in place in case people still need to upgrade
  • With just a couple of tweaks we were able to set the PHPStan level to 5

Closes #3487368

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