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/accessreview/drivers/driver.go

@@ -37,8 +37,8 @@ import (
 type AccountRecord struct {
 	Email       string
 	FullName    string
-	Role        string // system role/permission (e.g. "Admin", "Viewer")
-	JobTitle    string // HR job title / department (e.g. "Software Engineer")
+	Roles       []string // system roles/permissions (e.g. "Admin", "Viewer")
+	JobTitle    string   // HR job title / department (e.g. "Software Engineer")
 	Active      *bool
 	IsAdmin     bool
 	MFAStatus   coredata.MFAStatus