[Metrics] The recipientCount does not decrease when an active ADR is deleted

[aka4rKO]

Description:
This issue is created to track the fixing of the recipientCount metric not getting updated when an active ADR is deleted.

After further investigation it was identified that the revokeExistingApplicableConsents method only revokes consents after filtering by the username and hence all the consents are not revoked.

And as a result the recipientCount is not updated as expected.

Steps to reproduce:

1. Create an app
2. Create and approve 2 consents for 2 different users for the same app (Eg: [email protected], [email protected])
3. Invoke the admin metrics API and the recipientCount should increase by 1
4. Delete the aforementioned app
5. Invoke the admin metrics API and the recipientCount is not decreased (Expected: Must decrease by 1)