fix: Flaky tests with parallel tasks

[Nukesor]

The duration of the tasks in the worker_environment_variables test suite was too low, resulting in occasional flakes.

This should now be fixed, by making the tasks live longer.

This MR is mainly here to run this on the CI environment, as this only happens on potato machines.

[codecov-commenter]

Codecov Report

Merging #368 (e6515b9) into main (027d6fa) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #368      +/-   ##
==========================================
+ Coverage   77.16%   77.18%   +0.01%     
==========================================
  Files          71       71              
  Lines        4954     4957       +3     
==========================================
+ Hits         3823     3826       +3     
  Misses       1131     1131              

Impacted Files	Coverage Δ
daemon/task_handler/mod.rs	90.26% <ø> (ø)
daemon/task_handler/messages/mod.rs	92.00% <100.00%> (+1.52%)	⬆️
daemon/network/message_handler/remove.rs	94.73% <0.00%> (-0.07%)	⬇️

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