PB-318: Make NodeRequirementsInfo.cpu | gpu | memory optional

[cariad]

Nodes currently provide NodeRequirementsInfo.cpu, NodeRequirementsInfo.gpu and NodeRequirementsInfo.memory values to satisfy the legacy deployment.

In preparation for the legacy deployment being retired, this change makes those properties optional.

[Copilot]

Pull request overview

This PR makes the cpu, gpu, and memory fields optional in the NodeRequirementsInfo class in preparation for retiring the legacy deployment that currently requires these fields. Only the timeout field remains required.

Changes:

• Modified NodeRequirementsInfo to make cpu, gpu, and memory fields optional with None defaults
• Updated test parametrization to reflect only timeout as a required field
• Added new test test_node_requirements_info_min to verify instantiation with minimal (required-only) data
• Refactored test fixtures to support both minimal and full NodeRequirementsInfo configurations

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
uncertainty_engine_types/node_info.py	Made cpu, gpu, and memory fields optional with None defaults in NodeRequirementsInfo
tests/test_node_info.py	Updated parametrize list to only include timeout as required field and added test for minimal instantiation
tests/conftest.py	Refactored fixtures to include node_requirements_info_min_data and updated node_requirements_info_data to build on it

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