Distribution property's name displayed when running a test should be improved

Steps to reproduce

1. Go to a test
2. Click "Run Test" button
3. Observe the name (header) of the Distribution drop-down property

Expected results

The name should be "Distribution" or maybe "Distribution Type".

Actual results

The name is "Distribution Version".

I think this is a leftover because initially we thought of using a version for this property, but later we removed it.