[CORL-3105] increase rate limit for flagging comments in API

[nick-funk]

What does this PR do?

Adjust the rate limiting for createCommentFlag so it can execute twice as often for the same interval.

These changes will impact:

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

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

Changes the @rate(...) for createCommentFlag from @rate(seconds: 3) to @rate(max: 2, seconds: 3) which increases the max from a default of 1 to 2.

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?

• ensure you do not have DISABLE_RATE_LIMITERS set to true in your env vars
• find a comment in your database
• get its id and latest revision's id
• using the following mutation with an admin user bearer token, issue the mutation

mutation {
    createCommentFlag(input: {
        commentID: "<some-comment-id>",
        commentRevisionID: "<comments-latest-revision-id>",
        reason: COMMENT_REPORTED_OTHER,
        additionalDetails: "additional details",
        clientMutationId: "1"
    }) {
        comment {
            id
        }
    }
}

• check that you can do 2 of these every 3 seconds, otherwise you get rate limited

Were any tests migrated to React Testing Library?

No

How do we deploy this PR?

No special considerations.

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