WIP: Add file system access logger

What does this MR do?

This is an alternative approch to gitlab-org/gitlab-ce#53294

It's simpler than gitlab-org/gitlab-ce!22663

It logs only File.new invocation with mode and other parameters. Only write/append operations are errors, everything else is logged as info level.

It's disabled by default in production, but can be enabled with an ENV variable

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team