🎨 Improve load test framework (yet again)

[bisgaard-itis]

What do these changes do?

• When fixing the web responsivity test I realize that the setup I had done for handling settings for the load tests was unfortunate because it added a dependencies (psutil) which is complicated to install on certain linux distributions (like the docker containers where we run some of our tests).
• Moreover, I realized that the design was over complicated and the core functionality which would actually be useful could be easily factored out. This is done in this PR.

Related issue/s

How to test

Dev-ops checklist

• No ENV changes or I properly updated ENV (read the instruction)

[sanderegg]

thanks!

[pcrespov]

It looks more simple, which is a very good thing. Thx

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.6%. Comparing base (cafbf96) to head (6bf806e).
Report is 336 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (cafbf96) and HEAD (6bf806e). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (cafbf96)	HEAD (6bf806e)
unittests	1	0

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #6051      +/-   ##
=========================================
- Coverage    84.5%   63.6%   -21.0%     
=========================================
  Files          10     562     +552     
  Lines         214   28529   +28315     
  Branches       25     205     +180     
=========================================
+ Hits          181   18153   +17972     
- Misses         23   10325   +10302     
- Partials       10      51      +41     

Flag	Coverage Δ
integrationtests	63.6% <ø> (?)
unittests	?

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