Add ADVI float32 test to test_vi_float_precision (#5678)

[anandraj095]

This PR adds a parameterized test for Variational Inference (ADVI) under float32 precision.
It ensures VI does not break when using float32, complementing the existing float64 tests.

• Parameterized test using pytest.mark.parametrize for float32 and float64
• Overrides pytensor.config.floatX within the test
• Asserts that posterior samples (mu and sigma) have the correct dtype

Closes #5678.

[read-the-docs-community]

Documentation build overview

📚 pymc | 🛠️ Build #32061614 | 📁 Comparing 1b27943 against latest (0f5c0ca)

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glossary.html	📝 modified
contributing/developer_guide.html	📝 modified
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api/distributions/generated/classmethods/pymc.SymbolicRandomVariable.update.html	📝 modified
api/model/generated/classmethods/pymc.model.core.Model.compile_fn.html	📝 modified

[anandraj095]

Hi, CI is currently failing because test_vi_float.py appears to be completely ignored.

It seems this file might not be included in the CI test matrix.
Would you prefer that I add it to tests.yml, or should these tests be integrated into an existing file?

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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