Draft: Fix the bug: PrecisionMvNormalRV missing factor of 1/2 for log determinant in logp function

[olp-cs]

Description

Related Issue

• Closes BUG: PrecisionMvNormalRV missing factor of 1/2 for log determinant in logp function #7751

Checklist

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

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify)

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📚 Documentation preview 📚: https://pymc--7811.org.readthedocs.build/en/7811/

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