Add tests for scoring code

[priyakasimbeg]

Add unit and integration tests to test the following requirements:

In both strict=False and strict=True, to receive a finite score for a workload a submission must:

• Reach the validation target on the fixed workload within the maximum runtime.
• Reach the validation target fixed workload within 4x of the fastest submission.

In strict=True, to receive a finite score for a workload a submission must:

• Reach the validation target for at least 3/5 studies (the median).
• Take the best over 5 trials per study.
• Reach the validation target on the held-out workload (corresponding to the fixed workload) within the maximum runtime.
• Reach the validation target on the held-out workload (corresponding to the fixed workload) within 4x of the fastest submission.