Add benchmark for upload speed

[flozia]

Description

Adds an upload benchmark to the speed test.

Reference

VPN-2519: Speed test upload benchmark

Checklist

• [x] My code follows the style guidelines for this project
• [x] I have not added any packages that contain high risk or unknown licenses (GPL, LGPL, MPL, etc. consult with DevOps if in question)
• [x] I have performed a self review of my own code
• [x] I have commented my code PARTICULARLY in hard to understand areas
• [ ] I have added thorough tests where needed

[codecov-commenter]

Codecov Report

Base: 70.34% // Head: 70.23% // Decreases project coverage by -0.11% :warning:

Coverage data is based on head (2d5be91) compared to base (7b1e226). Patch coverage: 10.25% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4080      +/-   ##
==========================================
- Coverage   70.34%   70.23%   -0.12%     
==========================================
  Files         256      256              
  Lines       16086    16131      +45     
  Branches     8131     8162      +31     
==========================================
+ Hits        11316    11329      +13     
- Misses       4370     4401      +31     
- Partials      400      401       +1     

Flag	Coverage Δ
lottie_tests	56.33% <ø> (ø)
qml_tests	7.46% <0.00%> (-0.09%)	:arrow_down:
unit_tests	70.66% <10.25%> (-0.13%)	:arrow_down:

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

Impacted Files	Coverage Δ
src/constants.h	50.00% <ø> (ø)
src/featureslist.h	0.00% <0.00%> (ø)
src/networkrequest.h	0.00% <ø> (ø)
src/networkrequest.cpp	46.92% <10.52%> (-2.02%)	:arrow_down:
src/addons/addon.cpp	65.96% <0.00%> (-0.35%)	:arrow_down:
nebula/nebula.cpp	66.66% <0.00%> (ø)
src/addons/addon.h	100.00% <0.00%> (ø)
src/models/feature.cpp	67.34% <0.00%> (ø)
tests/unit/testaddon.cpp	100.00% <0.00%> (ø)
... and 4 more

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[flozia]

Added a feature flag for the upload benchmark that is disabled by default for now.