Improve "unique donors" variable to consider MBD passed users

[laurenluz]

"Unique donors" variable stored in our backend should include donors who "pass" qf-eligibility either via the MBD system or through passport.

In issue #4245 the requirements were:

• consider the total number of unique addresses that donated to qf projects during active round
• exclude donors whose passport score was below the "threshold"for passport
• exclude donors who were "flagged as sybil" for the round

We should improve this logic with the MBD change:

• consider the total number of unique addresses that donated to qf projects during active round
• exclude donors whose were not qf-eligible i.e. MBD score was lower than the threshold for MBD and passport score was below the "threshold" for passport
• exclude donors who were "flagged as sybil" for the round

cc @maryjaf