Add a `secretBadges` array to the user model

[nick-funk]

What does this PR do?

Adds a secretBadges array to the user model which is only configurable via Mongo and used for special cases by the organization.

These changes will impact:

• [ ] commenters
• [ ] moderators
• [ ] admins
• [X] 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?

N/A

How do I test this PR?

• use multi-site test with SSO users
• find an SSO user in Mongo, add a secretBadges array field to their user document and add an entry (they are string values in an array)
• visit the site and post a comment as that user via SSO
• see that the user has the "secret badge" you gave them in Mongo
• see that any other SSO badges also exist

Were any tests migrated to React Testing Library?

No

How do we deploy this PR?

If we want to formally release this, rebase this off of develop (instead of v8.7.1) and merge it as usual into develop.

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