notifications: add comment notification for subcoms

[carlinmack]

❤️ Thank you for your contribution!

Close inveniosoftware/invenio-requests#417

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[carlinmack]

this is the only line different between the two functions

[ntarocco]

Is this fixing somehow the notifications for comments in an inclusion/review request for a community too (not only sub-community)?

[slint]

Is this fixing somehow the notifications for comments in an inclusion/review request for a community too (not only sub-community)?

These are defined in invenio-rdm-records, but the fact that we now have the comment_notification_builder attribute on the request, means that we can override it per-request type and adjust recipients based on their type (users or communities).