♻️ Maintenance/reduce num unittests

[sanderegg]

What do these changes do?

Reduce the number of jobs of the CI, since the webserver ones are now faster.
This should provide more machines available to other PRs.

Related issue/s

How to test

Checklist

[codecov]

Codecov Report

Merging #2525 (6b3e82b) into master (754fe5a) will decrease coverage by 4.0%.
The diff coverage is 25.0%.

@@           Coverage Diff            @@
##           master   #2525     +/-   ##
========================================
- Coverage    76.9%   72.8%   -4.1%     
========================================
  Files         622     575     -47     
  Lines       24028   22561   -1467     
  Branches     2355    2177    -178     
========================================
- Hits        18478   16442   -2036     
- Misses       4922    5587    +665     
+ Partials      628     532     -96     

Flag	Coverage Δ
integrationtests	78.6% <ø> (+13.1%)	⬆️
unittests	69.2% <25.0%> (-2.2%)	⬇️

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

Impacted Files	Coverage Δ
...r/src/simcore_service_webserver/groups_handlers.py	28.9% <0.0%> (-35.4%)	⬇️
...server/src/simcore_service_webserver/groups_api.py	32.4% <33.3%> (-59.2%)	⬇️
...simcore_service_webserver/computation_subscribe.py	30.0% <0.0%> (-61.3%)	⬇️
...imcore_service_webserver/exporter/export_import.py	34.1% <0.0%> (-61.0%)	⬇️
...vice_webserver/exporter/formatters/formatter_v2.py	31.9% <0.0%> (-56.4%)	⬇️
...vice_webserver/exporter/formatters/formatter_v1.py	24.5% <0.0%> (-54.2%)	⬇️
...c/simcore_service_webserver/users_to_groups_api.py	46.1% <0.0%> (-53.9%)	⬇️
...rc/simcore_service_webserver/login/confirmation.py	33.3% <0.0%> (-47.3%)	⬇️
...src/simcore_service_webserver/groups_exceptions.py	53.3% <0.0%> (-46.7%)	⬇️
... and 86 more

[sanderegg]

not a priority