Remove code needed for AiiDA v1

[danielhollas]

Follow up to #87

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.60%. Comparing base (63a3f44) to head (180bd0f).

Files with missing lines	Patch %	Lines
aiida_test_cache/archive_cache/_utils.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #90      +/-   ##
==========================================
+ Coverage   89.00%   92.60%   +3.60%     
==========================================
  Files           9        9              
  Lines         482      460      -22     
==========================================
- Hits          429      426       -3     
+ Misses         53       34      -19     

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[ltalirz]

feel free to go ahead with these PRs