fix(bendpy): detect python3 in release wheel builds

[sundy-li]

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Summary

• fix the release wheel build normalization step to use an available Python interpreter on Linux runners

Implementation

1. Replace the hardcoded python invocation in the release-wheel cargo-config normalization step
2. Detect python3 first and fall back to python
3. Fail early with a clear message if neither interpreter exists

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Pair with the reviewer to explain why

Validation performed:

• inspected the failing Build Linux Wheels (aarch64, ARM64) log from run 24285204342
• verified the failure was python: command not found in the normalization step

Type of change

• Bug fix (non-breaking change which fixes an issue)

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This change is