Truncate access review roles with badge list

Long role strings in the access review table broke row layout when
drivers joined many roles into one comma-separated value. Expose
roles as a string array in GraphQL by splitting the stored role at
the API layer, and render the first three roles as badges with a
"+X more" popover for the rest.

Closes ENG-459.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/server/api/console/v1/graphql/access_review_campaign.graphql

@@ -377,7 +377,7 @@ type AccessReviewEntry implements Node {
     campaignSource: AccessReviewCampaignSource! @goField(forceResolver: true)
     email: String!
     fullName: String!
-    role: String!
+    roles: [String!]!
     jobTitle: String!
     isAdmin: Boolean!
     active: Boolean