Update tests

[PhilippRue]

• use AiiDA caching for calculation tests and for calculations in workflow tests
• uses enable_archive_cache from aiida-test-cache (currently under development)
• so far tests don't work with aiida-core >= v2.6 since this breaks the hashing
• some workchain tests are still broken or missing
  • jij
  • kkrimp_sub
  • combine_imps
  • KKRnano DOS
  • KKR-BdG
  • STM

[codecov]

Codecov Report

Attention: Patch coverage is 21.33333% with 826 lines in your changes missing coverage. Please review.

Project coverage is 57.82%. Comparing base (b2bf5ba) to head (335aa03).
Report is 65 commits behind head on develop.

Files with missing lines	Patch %	Lines
aiida_kkr/tools/tools_STM_scan.py	0.00%	211 Missing ⚠️
aiida_kkr/workflows/kkr_STM.py	14.69%	180 Missing ⚠️
aiida_kkr/workflows/_combine_imps.py	2.70%	108 Missing ⚠️
aiida_kkr/tools/imp_cluster_tools.py	15.51%	98 Missing ⚠️
aiida_kkr/tools/ldau.py	4.08%	47 Missing ⚠️
aiida_kkr/workflows/kkr_imp_dos.py	18.75%	39 Missing ⚠️
aiida_kkr/workflows/imp_BdG.py	3.70%	26 Missing ⚠️
aiida_kkr/calculations/kkrimp.py	35.13%	24 Missing ⚠️
aiida_kkr/tools/combine_imps.py	19.23%	21 Missing ⚠️
aiida_kkr/workflows/kkr_imp_sub.py	38.46%	16 Missing ⚠️
... and 13 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #165      +/-   ##
===========================================
+ Coverage    56.10%   57.82%   +1.71%     
===========================================
  Files          100      102       +2     
  Lines        14009    14606     +597     
===========================================
+ Hits          7860     8446     +586     
- Misses        6149     6160      +11     

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