Update config.default.yml

[rnovikovP]

PR to track os version

Example of exposing on PMM:

echo 'node_os{os_version="el9"} 1' > /usr/local/percona/pmm2/collectors/textfile-collector/low-resolution/node_os.prom

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 42.65%. Comparing base (40f79fd) to head (331a3ce). Report is 702 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2008      +/-   ##
==========================================
- Coverage   42.66%   42.65%   -0.01%     
==========================================
  Files         386      386              
  Lines       47016    47016              
==========================================
- Hits        20059    20057       -2     
- Misses      25094    25095       +1     
- Partials     1863     1864       +1     

Flag	Coverage Δ
managed	43.82% <ø> (-0.01%)	:arrow_down:

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