refactor: consolidate log file collection logic

[QuakeWang]

Bug Behavior

Step 3 Routine Load Tools
[i]  Executing routine_load_performance_analyzer...
Analyze recent minutes: 50
[i]  Analyzing FE logs in /opt/selectdb/fe/log for job 667132769802263 (last 50 min)...
[i]
[*]  Tool execution failed due to configuration issues.
[!]  Error: IO error: stream did not contain valid UTF-8
[i]

What Cause?

Because in the fe/log directory, there are some files like fe.log.tar.gz, we need to filter them.