Rewrite scalar dot as multiplication #1205

[SwarnimShekhar]

Description

• Optimized local_blockwise_dot_to_mul to handle (1,1) @ (1,1) cases as direct elementwise multiplication.
• Prevents unnecessary reshaping for scalar-like tensors.
• Ensures consistency with other elementwise multiplication cases.

Related Issue

• [ ] Closes #
• [ ] Related to #

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://pytensor--1263.org.readthedocs.build/en/1263/