fix: cursor-change after layer-interaction update

[RobertOrthofer]

Implemented changes

This PR fixes an issue described in #1404, where the cursor did not change correctly when the interaction was added by updating an existing layer.
The issue was that in #1348 the interactions were taken from the properties of the ol-layer directly instead of the _jsonDefinition or the interactions or the eoxMap.

A test was added to test both the cursor as well as the select-interaction itself if the interaction was added after a delay.

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[A-Behairi]

Thank you for the fix!