Bugfix/workflow task name handling

[AleksMat]

This PR fixes 2 bugs regarding how EOTask names are handled in EOWorkflows.

[codecov-io]

Codecov Report

Merging #178 into develop will increase coverage by 0.09%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #178      +/-   ##
===========================================
+ Coverage    79.73%   79.83%   +0.09%     
===========================================
  Files           45       45              
  Lines         4664     4671       +7     
===========================================
+ Hits          3719     3729      +10     
+ Misses         945      942       -3

Impacted Files	Coverage Δ
core/eolearn/core/eoworkflow.py	90.32% <100%> (+0.46%)	⬆️
.../eolearn/visualization/eoworkflow_visualization.py	93.33% <100%> (+5.45%)	⬆️
.../eolearn/visualization/eoexecutor_visualization.py	85.18% <0%> (+1.23%)	⬆️

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