Acceptance/Integration Tests introduction

[michelvocks]

Acceptance/Integration tests are really important because they ensure that multiple components can still work together. In the past, we did this manually which had a negativ impact on our feature development time as well as it opened the door to introduce misterious side effects into Gaia.

This PR is the start of implementing an Acceptance/Integration test framework (we just use go tests) which also requires some refactoring.

[michelvocks]

One job is failing because of the race condition which should be fixed with my other PR. Once #132 has been merged and the job doesn't crash it should be ready to get merged! 🤗

[Skarlso]

Really like the extraction of the server side stuff to server.go instead of making main even bigger. Nice job. :)

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@a1cbf49). Click here to learn what that means.
The diff coverage is 33.33%.

@@            Coverage Diff            @@
##             master     #133   +/-   ##
=========================================
  Coverage          ?   64.02%           
=========================================
  Files             ?       25           
  Lines             ?     2171           
  Branches          ?        0           
=========================================
  Hits              ?     1390           
  Misses            ?      626           
  Partials          ?      155

Impacted Files	Coverage Δ
services/service_provider.go	77.77% <ø> (ø)
workers/pipeline/create_pipeline.go	50% <33.33%> (ø)

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