[TESTS] Add global random seed for deterministic test#2
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Description
This PR sets a fixed global random seed for each pytest session, making tests deterministic and easier to debug.
Motivation
Some tests rely on randomness without setting an explicit seed. This can result in nondeterministic behavior and make failures difficult to reproduce, especially in CI environments.
Changes
A global random seed is initialized at the beginning of each pytest session to ensure consistent behavior across test runs.
Benefits
The issue was identified during an ongoing research project.