chore: fix hybrid model glwe lora mlp

[jfrery]

closes https://github.com/zama-ai/concrete-ml-internal/issues/4671

[github-actions]

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[andrei-stoian-zama]

I think we need a way to ensure we don't keygen every time the forward of the hybrid model is called

[github-actions]

⚠️ Known flaky tests have been rerun ⚠️

One or several tests initially failed but were identified as known flaky. tests. Therefore, they have been rerun and passed. See below for more details.

Failed tests details

Known flaky tests that initially failed:

• tests/torch/test_compile_torch.py::test_compile_torch_or_onnx_conv_networks[True-True-CNN_grouped-relu]- tests/torch/test_compile_torch.py::test_compile_torch_or_onnx_networks[get_and_compile--FHE_simulation-BranchingGemmModule-5-relu]

[github-actions]

Coverage failed ❌

Coverage details

---------- coverage: platform linux, python 3.8.18-final-0 -----------
Name                                                     Stmts   Miss  Cover   Missing
--------------------------------------------------------------------------------------
src/concrete/ml/quantization/linear_op_glwe_backend.py      56     19    66%   42, 100-150
src/concrete/ml/torch/hybrid_model.py                      183      3    98%   421, 478, 482
--------------------------------------------------------------------------------------
TOTAL                                                     8421     22    99%

60 files skipped due to complete coverage.