* fix: resolve REQUEST_URI fatal error and JWT key length issues in CI
QLSessionHandlerTest::tearDown() was calling unset($_SERVER) which
destroyed the entire superglobal. WordPress cron.php then fataled on
shutdown when accessing $_SERVER['REQUEST_URI']. Changed to only unset
the specific HTTP_WOOCOMMERCE_SESSION key.
Also updated JWT secret keys to meet firebase/php-jwt v7's minimum
32-byte requirement for HS256 in both test config and Docker entrypoint.
* fix: the rest of the files added
* devops: php7.4 removed from matrix
* chore: Linter compliances met
* devops: More broken test updated
* devops: Tests updated for CI
* fix: QLSessionHandlerCest fixed
* fix: QLSessionHandlerCest fixed
* devops: CI fixed