fix/connect-timeout-v2

[SeBsZ]

• Fixes check_tcp_responsiveness so it doesn't trigger excessive logging in MariaDB 10.4+ by switching from legacy fsockopen to mysqli_real_connect + mysql_close. Backwards compatible.
• MYSQLI_OPT_CONNECT_TIMEOUT force sets a timeout instead of falling back to the OS level TCP SYN retry - ~60s on linux
• More info about this: https://github.com/illogical-robot/apkmirror.com/issues/2376

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[gemini-code-assist]

Code Review

This pull request enhances the database connection process by implementing per-database connection timeouts and improving the TCP responsiveness check. Specifically, it now uses mysqli_real_connect with credentials when available to avoid MariaDB authentication warnings and pre-auth abort errors. The review feedback identifies a compatibility issue where using \Throwable would break support for PHP versions prior to 7.0 and suggests using \Exception instead. Additionally, it was noted that the error suppression operator is used inconsistently across mysqli_options calls and should be removed for clarity.