test: Add unit tests for `evaluation_executor`

[robinholzi]

Motivation

Let's increase test coverage for EvaluationExecutor. Testing this component is a bit nasty as it uses many other components, but okay.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.52%. Comparing base (5ad108a) to head (c755b20).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #513 +/- ## ========================================== + Coverage 82.18% 82.52% +0.34% ========================================== Files 214 214 Lines 9961 9961 ========================================== + Hits 8186 8220 +34 + Misses 1775 1741 -34 ```

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[github-actions[bot]]

^{( % to main) ( % to main)}