MetricPipeline in not limited in n_resamples in tests

[yoavkatz]

This is the root cause: https://github.com/IBM/unitxt/blob/main/src/unitxt/test_utils/metrics.py#L75

I think we need to test if the inner metric in MetricPipeline is GlobalMetri object and if so, set the n_resamples=3 to it.