Decide the policy whether or not to run with pruning option in CIs

[nzw0301]

Motivation

Several Optuna example scripts have pruning option --pruning, more concretely,

python pytorch_lightning_simple.py --pruning

as in this example.

But currently CIs have not performed with such pruning option.

Description

I'm wondering if we could decide the policy whether or not to use the pruning option in CIs:

1. Without pruning only (as in the current example's CIs)
2. With pruning only
3. Both

Alternatives (optional)

Additional context (optional)

• #43 (comment)

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