Remove exception re-raising with svd

[ValerianRey]

• Remove exception re-raising when torch.linalg.svd raises a LinalgError in _compute_normalized_gramian

This error is raised when the matrix contains nan values. It might also be raised for some very special ill-conditioned matrices (https://discuss.pytorch.org/t/fail-to-run-torch-linalg-svd-because-error-11/150418), but we could not reproduce this. The only point of re-raising this error was to get to know which kind of matrices could make these operations fail, but it's actually simpler to not have to maintain this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
src/torchjd/aggregation/_gramian_utils.py	100.00% <100.00%> (+9.09%)	⬆️

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