DSA final copy updates

[nick-funk]

What does this PR do?

• Final copy text for titles and descriptions on notifications
• Some new icons for notifications (rejected comment icon)
• Updated styles for the embedded comment on some notifications, updates the text and makes the toggle-able comment component more re-usable

These changes will impact:

• commenters
• 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?

• create some comments
• DSA report and decide on the report for some of the comments
• regularly reject some comments in the mod queues
• check the notifications for both the reporters and the commenters to see new copy and styles in notifications area

Where any tests migrated to React Testing Library?

No

How do we deploy this PR?

• Merge into DSA epic branch

[kabeaty]

Very nice!