Random seeds are reused between experiments in same Ert instance

[SAKavli]

I added:

print(random_seed)

to sample_prior() in sample_prior.py.

When I run multiple experiments using the same Ert instance, they have the same random seed.
I would expect the sampled values between experiments to be different, but they are the same.

This can be recreated by running a test-data example without hardcoded random seed twice.

Screen.Recording.2025-12-21.at.11.12.01.mov

I was curious if this is a bug or not, hence needs-discussion label.