1561 computation of denoising posterior precision matrix in jac method score fn iid

[manuelgloeckler]

Fixes #1561

[codecov]

Codecov Report

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✅ All tests successful. No failed tests found.

Additional details and impacted files

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  Files           ?      135           
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Flag	Coverage Δ
unittests	82.55% <100.00%> (?)

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Files with missing lines	Coverage Δ
sbi/inference/potentials/score_fn_iid.py	88.62% <100.00%> (ø)

[manuelgloeckler]

I just enabled some of the testing (which was previously completely skipped). With the bug fix now, jac_gauss also passes at 16 trials just like auto_gauss.

[janfb]

Great! Thanks for fixing this @manuelgloeckler and thanks to @touronc for spotting it! 🚀