Prepare for Python 3.12 and 3.13: drop distutils, make GLT install fa…

[kmontemayor2-sc]

…ilures fatal

Python 3.12 removed distutils and the deprecated unittest aliases, and GiGL uses both. The distutils imports work today only because setuptools is installed transitively and ships a compatibility shim; a library must not depend on that.

• Add gigl.common.utils.parse.str_to_bool and use it in place of distutils.util.strtobool at all 15 call sites. Accepted and rejected spellings match strtobool. Every call site already coerced the result with bool() or used it as a condition, so the int to bool return change is not observable.
• Rename the 26 assertEquals / assertNotEquals uses to assertEqual / assertNotEqual, and select ruff UP005 so they cannot return.
• Make a failed install_glt.sh fatal. main() returned the child's status but the __main__ block discarded it, so requirements/install_py_deps.sh saw exit 0 under set -e and every base image build continued after a failed GLT install. Measured against a stub that exits 7: the old script exits 0, the new one exits 7. A successful install still exits 0.
• Run ty twice in make type_check, at the 3.11 floor and at 3.13. ty resolves the standard library against one version per invocation, so the floor pass accepts modules 3.13 removed and only the ceiling pass rejects them.

Scope of work done

Where is the documentation for this feature?: N/A

Did you add automated tests or write a test plan?

Updated Changelog.md? NO

Ready for code review?: NO

[kmontemayor2-sc]

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