DSA no notifications placeholder text

[nick-funk]

What does this PR do?

• Show placeholder text when user has no notifications
• Make method of redress email/url a link

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?

• Turn on DSA mode in Admin > Configure > General > DSA
• Select the Email or URL option for method of redress and provide a value
• Make a new user
• Check their notifications
• See that they have a placeholder when they have no notifications
• Create a comment
• Reject it
• Check notifications
• See that the notification appeared for the rejection
• See that the method of redress shows with a link to the email/url option you filled out in the config earlier

Where any tests migrated to React Testing Library?

No

How do we deploy this PR?

• Merge to DSA epic branch

[netlify]

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[kabeaty]

Looks good, approving! Left one small question.