Add test setup

[TomDijkema]

Commit adds setup for test cases. This still needs future work, because it is not yet clear how to successfully mock the Keycloak user. The Redux state and data from API calls can be successfully mocked.

Adds:

• Special test renderer for rendering components while testing
• Basic test for specimen component

[sonarcloud[bot]]

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0 Bugs
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0 Security Hotspots
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0.0% Coverage
0.0% Duplication