Send notification when initiative reaches 100% of support thereshold
**Is your feature request related to a problem? Please describe.**
We currently have notifications for milestones (25%, 50%, 75%) leading to the support threshold but none for when the notification reaches the support threshold.
**Describe the solution you'd like**
I'd like : authors, promoting committee members, followers of the initiative and admins to receive a notification when an initiative reaches the support threshold.
**Describe alternatives you've considered**
Setting a milestone to 100%. Not sure if it'd work.
The PR is here
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