[UHN-BS-35] Help request sends to unavailable responders

[mxnyee]

Was this always a problem or am I missing something?

To reproduce:

• make sure user A is a responder for user B
• log in as user A and turn off the Naloxone availability switch
• make a help request for user B
• result: user A gets a help request notification
• expected result: A should not get a notification because he doesn't have Naloxone

In help_request.js:71, we're adding all of the user's responders to the help request. But we should filter out the responders who aren't available, right?

Same in notification.service.js:11. We only want the push tokens of responders who are available. Isn't this what the userResponders field in the help_request is for?

[Asiapenguin]

I agree with the changes highlighted in this issue