feat: start progress tracking before FW unpacking

[jstucke]

• start tracking the progress of the (root) firmware file object before unpacking (so that it can be seen earlier in the status page of the webinterface)
  • this fixes the "bug" that the progress seemingly hangs after upload if unpacking takes long

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.60%. Comparing base (fc5eae9) to head (bd43770).

Files with missing lines	Patch %	Lines
src/scheduler/analysis_status.py	94.44%	1 Missing :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1381   +/-   ##
=======================================
  Coverage   91.59%   91.60%           
=======================================
  Files         374      374           
  Lines       21032    21053   +21     
=======================================
+ Hits        19265    19286   +21     
  Misses       1767     1767           

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