[tracing-appender] Use file's mtime instead of created time to sort. #3288
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First, rolling based on modified time and created time should not be much different.
On the other hand, because the created time attribute has higher requirements for the Linux kernel version (>=4.11), while the modified time does not have this restriction, it has a wider range of usage scenarios.
When the host Linux kernel version is less than 4.11, the roll function is not available, which will lead to more and more log files, and then cause the disk to be full.