Refactoring/e2e tests

[kwitsch]

Changes:

• removed tmpDir in favor of individual testfiles
• replaced WithNetwork with a modified version of the testcontainer PR
• moved some functions to different files to declutter containers.go

I opted for a modified version since the original one doesn't remove the network after the tests finish and also use context.Background()(which could be avoided with the Ginkgo context).

Behavior change to ensure only containers for the current test are inside the network:

• it is created during the first WithNetwork costomization
• it is deleted after the last container detaches
• during deletion a new network name is generated

Closes #1224

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (03131c4) 93.74% compared to head (2f6524d) 93.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1316      +/-   ##
==========================================
+ Coverage   93.74%   93.83%   +0.09%     
==========================================
  Files          77       77              
  Lines        6200     6200              
==========================================
+ Hits         5812     5818       +6     
+ Misses        299      293       -6     
  Partials       89       89              

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