Update BufferedPacketLogWriter to empty buffer when closing file

[ryanmelt]

closes #667

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.09 ⚠️

Comparison is base (b343211) 71.08% compared to head (754694d) 71.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #670      +/-   ##
==========================================
- Coverage   71.08%   71.00%   -0.09%     
==========================================
  Files         469      468       -1     
  Lines       29982    29942      -40     
  Branches      816      816              
==========================================
- Hits        21313    21259      -54     
- Misses       8586     8598      +12     
- Partials       83       85       +2     

Flag	Coverage Δ
frontend	58.41% <ø> (-0.24%)	⬇️
ruby-api	51.31% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...enc3/lib/openc3/logs/buffered_packet_log_writer.rb	95.23% <ø> (-1.32%)	⬇️
openc3/lib/openc3/logs/log_writer.rb	89.94% <ø> (-0.41%)	⬇️
openc3/lib/openc3/logs/packet_log_writer.rb	98.99% <ø> (-0.02%)	⬇️
...3/lib/openc3/microservices/reducer_microservice.rb	92.25% <ø> (-0.18%)	⬇️
openc3/lib/openc3/utilities/bucket_utilities.rb	91.95% <ø> (-0.19%)	⬇️

... and 7 files with indirect coverage changes

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