in_tail: disable debug fs event logs for inputs targeting fluentbit's own logfile

[nuclearpidgeon]

Addresses #9641

Testing

• [ ] Example configuration file for the change
• [ ] Debug log output from testing the change
• [ ] Attached Valgrind output that shows no leaks or memory corruption was found

Documentation

• [ ] Documentation required for this feature - yes, probably, TODO

Backporting

• [x] Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.