Optimize and expand cryodrgn_beta test coverage #455
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Implement a comprehensive test optimization strategy to improve coverage, reduce execution time, and better utilize 4-CPU parallelization.
The existing test suite suffered from suboptimal parallelization (using only 2 of 4 available CPUs), mixed test complexities, and inefficient fixture scoping, leading to long execution times. This PR addresses these issues by introducing a stratified execution strategy, optimized pytest configuration, and improved fixture management, aiming for a 60-80% reduction in test execution time.