Refactor test suite to align with new code structure

[michaelosthege]

• 🚚 This moves methods to EvoWorklist which should not have been located in BaseWorklist to begin with.
• 🚚 Also merges definitions of InvalidOperationError and CompatibilityError into robotools.worklists.exceptions.
• 🚚 Splits & moves the tests to align with the new structure, and to avoid deprecation warnings.

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (1a4c5dd) 93.04% compared to head (97d2615) 93.05%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
robotools/evotools/worklist.py	22.22%	21 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #56   +/-   ##
=======================================
  Coverage   93.04%   93.05%           
=======================================
  Files          18       18           
  Lines        1050     1051    +1     
=======================================
+ Hits          977      978    +1     
  Misses         73       73           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[michaelosthege]

closed in favor of #54