Improve notifications in BioPortal

[alexskr]

Aggregate issue for keeping track the notification refactor https://github.com/ncbo/ontologies_linked_data/pull/148 PR and all associated tasks

PR needs additional changes done for it to get deployed in BioPortal.

1. needs ability to disable notifications send to BioPortal admin team when new users/ontologies/submissions are created. https://github.com/ncbo/ontologies_linked_data/pull/148#pullrequestreview-1760307618

2. differentiate between contacting BioPortal Admin team and contacting support email list. https://github.com/ncbo/ontologies_linked_data/pull/148#discussion_r1412535250

3. add option for ontology admins to opt-in/opt-out of notifications. (low priority)

4. Add mechanism for subscribing to ontology subscription notifications in UI and API https://github.com/ncbo/bioportal_web_ui/issues/305

[alexskr]

1 and 2 are addressed by https://github.com/ncbo/ontologies_linked_data/pull/184

[alexskr]

related items:

• https://github.com/ncbo/ontologies_linked_data/issues/185
• https://github.com/ncbo/ontologies_linked_data/issues/190
• https://github.com/ncbo/bioportal_web_ui/issues/305
• https://github.com/ncbo/bioportal_web_ui/issues/308
• https://github.com/ncbo/ncbo_cron/issues/77