[CORL-409] Prevent users from ignoring staff members (#2355)

* Throw error if user tries to ignore a staff member

Throws a UserCannotBeIgnoredError if a user tries to ignore
a user who is a staff member. A staff member in this case is
considered anyone who has a role of staff, moderator, or admin.

CORL-409

* Prevent users from ignoring staff in the user info popover

Creates the staff roles in a constant next to the user model.
Uses this to add a computed property to the user resolver.

CORL-409

* Remove unnecessary async declaration from userIsStaff helper function

CORL-409

* Specify ignoreable on users in client test fixtures

Allows the tests to pass for the required computed property
of ignoreable that is computed by whether a user is a staff
member or not.

CORL-409

* Update more fixtures with ignoreable property on mocked users/commenters

CORL-409

* Consolidate ignore-able calculation into re-usable helper methods

Re-use the logic for whether a role is a staff member to
clearly define when a user is ignore-able or not across the
business logic.

CORL-409

* Set the ignoreable optimisticResponse on comment mutations

We have set the ignoreable value in the graphQL schema, so now
the optimisticResponses are looking for a default value to use
until the data result arrives. Put to false since the ignoreable
value is set on our author, we likely don't want to ignore ourselves.

CORL-409

src/core/server/graph/tenant/resolvers/User.ts

@@ -6,6 +6,7 @@ import {
   GQLUserTypeResolver,
 } from "coral-server/graph/tenant/schema/__generated__/types";
 import * as user from "coral-server/models/user";
+import { roleIsStaff } from "coral-server/models/user/helpers";
 
 import { UserStatusInput } from "./UserStatus";
 import { getRequestedFields } from "./util";
@@ -41,4 +42,5 @@ export const User: GQLUserTypeResolver<user.User> = {
   }),
   ignoredUsers: ({ ignoredUsers }, input, ctx, info) =>
     maybeLoadOnlyIgnoredUserID(ctx, info, ignoredUsers),
+  ignoreable: ({ role }) => !roleIsStaff(role),
 };

src/core/server/graph/tenant/schema/schema.graphql

@@ -1456,6 +1456,13 @@ type User {
       permit: [SUSPENDED, BANNED]
     )
 
+  """
+  ignoreable is a computed property based on the
+  user's role. Typically, users with elevated privileges
+  aren't allowed to be ignored.
+  """
+  ignoreable: Boolean!
+
   """
   comments are the comments written by the User.
   """