Bootstrap/Load: Refactor debug.log handling for enhanced protection and usability

[christian-dale]

This commit addresses concerns related to the /wp-content/debug.log file being publicly accessible, which may contain sensitive information in some circumstances. To mitigate this risk, a randomly generated string is now appended to the debug log filename. The debug.log file has also been prefixed with a dot, to make it a hidden file.

These changes enhance both the protection and usability of the debug.log subsystem.

Trac ticket: https://core.trac.wordpress.org/ticket/60611

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[Luc45]

Instead of generating a new debug log for every request, maybe we could use a deterministic, unique filename based on that site's salts? If the debug log file is persistent, I think there's no need for the debug directory, we basically keep everything as-is, but just randomize the debug log filename. Also, it could be prefixed with a dot to leverage the "hidden file" convention, as most web servers won't serve hidden files to web clients.

[christian-dale]

@Luc45 Thank you for your feedback. I have made the suggested changes.