Hide Stage in the Value Finder propensity plots

[StijnKas]

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Issue description

We should not show the propensity stage in this plot, as the propensities should be equal across stages.

Reproducible example

The plot propensity distribution function

Expected behavior

We should just hide this. It doesn’t add any real value but could only cause cause confusion because propensities should not change across stages. The only current benefit could be reproducibility, but I don’t think this needs to be reproduced.

Installed versions

Latest