Fix bug when freezing model with partially observed RVs

[ricardoV94]

Description

The problem was that the constant_fold call in create_partially_observed_rv was cloning the shared variable that defined the dim_length, and therefore it could no longer be replaced by it in freeze_data_and_dims

Related Issue

• [x] Closes #7387
• [x] Closes #7316

Checklist

• [x] Checked that the pre-commit linting/style checks pass
• [x] Included tests that prove the fix is effective or that the new feature works
• [x] Added necessary documentation (docstrings and/or example notebooks)
• [x] If you are a pro: each commit corresponds to a relevant logical change

Type of change

• [ ] New feature / enhancement
• [x] Bug fix
• [ ] Documentation
• [ ] Maintenance
• [ ] Other (please specify):

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📚 Documentation preview 📚: https://pymc--7388.org.readthedocs.build/en/7388/

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.19%. Comparing base (7af0a87) to head (e2f86cb).

Additional details and impacted files

[](https://app.codecov.io/gh/pymc-devs/pymc/pull/7388?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymc-devs) ```diff @@ Coverage Diff @@ ## main #7388 +/- ## ======================================= Coverage 92.19% 92.19% ======================================= Files 103 103 Lines 17214 17214 ======================================= Hits 15870 15870 Misses 1344 1344 ``` | [Files](https://app.codecov.io/gh/pymc-devs/pymc/pull/7388?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymc-devs) | Coverage Δ | | |---|---|---| | [pymc/pytensorf.py](https://app.codecov.io/gh/pymc-devs/pymc/pull/7388?src=pr&el=tree&filepath=pymc%2Fpytensorf.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pymc-devs#diff-cHltYy9weXRlbnNvcmYucHk=) | `90.44% <100.00%> (ø)` | |