PHP 8 patches

Patch list:

([PHP 8.0] Function libxml_disable_entity_loader() is deprecated) https://github.com/phpmyadmin/phpmyadmin/commit/cabe45f5a44bec8b91f7cee463db4899555ac771
(PHP 8 error on preg_replace) https://github.com/phpmyadmin/phpmyadmin/commit/b8e4d932b7bebcd1e4371c608117b1336fff8d99
(Fix undefined array keys) https://github.com/phpmyadmin/phpmyadmin/commit/0e728a67c5fd30fb15085b80e22d2b4fc48dee4a (maybe not needed, tests only)
(PHP 8 error TypeError: Unsupported operand types: string/int) https://github.com/phpmyadmin/phpmyadmin/commit/ff52752bc0c457154dfb9cdcb56d77a9a603fb18
(Fix PHP 8.0 "TypeError: preg_replace():" errors) https://github.com/phpmyadmin/phpmyadmin/commit/00b419afe147624238d44dc5fe62a7cf07b14134
(PHP 8.0 failing tests when comparing 0 to '') https://github.com/phpmyadmin/phpmyadmin/commit/bdc8760bc350b8422cf7ac722ccfa5b9ef268ac4

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