MC-31618: Move static config to files - PLUGIN_LIST

- Fix unit tests;
- Some assertions from PluginList unit test were removed because its logic was moved to ConfigWriter;

Author: adifucan

dev/tests/integration/testsuite/Magento/Framework/Interception/AbstractPlugin.php

@@ -127,8 +127,6 @@ public function setUpInterceptionConfig($pluginConfig)
                 'preferences' => [
                     \Magento\Framework\Interception\PluginListInterface::class =>
                         \Magento\Framework\Interception\PluginList\PluginList::class,
-                    \Magento\Framework\Interception\ChainInterface::class =>
-                        \Magento\Framework\Interception\Chain\Chain::class,
                     \Magento\Framework\Interception\ConfigWriterInterface::class =>
                         \Magento\Framework\Interception\ConfigWriter::class
                 ],