track output files

[andre-merzky]

fixes #3275

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review.

Project coverage is 42.83%. Comparing base (04bd848) to head (9defbc1).
Report is 4 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/radical/pilot/agent/staging_output/default.py	0.00%	9 Missing ⚠️
src/radical/pilot/task.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #3276   +/-   ##
=======================================
  Coverage   42.83%   42.83%           
=======================================
  Files          97       97           
  Lines       11264    11282   +18     
=======================================
+ Hits         4825     4833    +8     
- Misses       6439     6449   +10     

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[mtitov]

LGTM!