total number of participants in a group in an experiment (previously test)

[Zarifa-nabil]

When:
Case1:

1. creating a new group with 0 participants
2. adding this group to an experiment (previously test)
3. add participants to the group by creating a batch of token.
4. the total number of participants in the experiment (previously test) is not updated.

But when:
Case2:

1. creaing a new group with 5 participants (for example) with batch of token.
2. add this group to an experiment (previously test)
3. the total number of participants in the experiment (previously test) is updaed (with the number of participants in both case1 and case2)