Hook up remaining DSA notifications

[nick-funk]

What does this PR do?

• Hooks up the DSA notifications that happen when a user's comment is deemed illegal
• Hooks up DSA reason information when comments are rejected into notifications

These changes will impact:

• [X] commenters
• [X] moderators
• [ ] admins
• [ ] developers

What changes to the GraphQL/Database Schema does this PR introduce?

None

Does this PR introduce any new environment variables or feature flags?

No

If any indexes were added, were they added to INDEXES.md?

No new indices.

How do I test this PR?

DSA Reporting:

• Create a comment
• Report it with the DSA reporting
• Process the comment with an admin/mod user in the DSA report flow
• Decide the comment is illegal in the DSA report flow
  • Specify the grounds and explanation
• Check the original user's notifications
  • See a new notification showing the illegal reasoning, grounds, explanation, and the referenced comment
• Check the reporting user's notifications
  • See a new notification indicating that the report decision was made

General Approve/Reject of comments with reasons:

• Create a comment
• Reject it using an admin/moderator account in the mod queues
  • Provide a reason
• Check notifications of the original commenter
  • See that they have a notification indicating the rejection code and other legal details

Where any tests migrated to React Testing Library?

No

How do we deploy this PR?

No special considerations, it goes into the DSA epic branch when complete.

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