[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/errors/index.ts

@@ -573,6 +573,15 @@ export class UserSuspended extends CoralError {
   }
 }
 
+export class UserCannotBeIgnoredError extends CoralError {
+  constructor(userID: string) {
+    super({
+      code: ERROR_CODES.USER_CANNOT_BE_IGNORED,
+      context: { pub: { userID } },
+    });
+  }
+}
+
 export class PasswordResetTokenExpired extends CoralError {
   constructor(reason: string, cause?: Error) {
     super({

src/core/server/errors/translations.ts

@@ -27,6 +27,7 @@ export const ERROR_TRANSLATIONS: Record<ERROR_CODES, string> = {
   TOKEN_NOT_FOUND: "error-tokenNotFound",
   USER_NOT_ENTITLED: "error-userNotEntitled",
   USER_NOT_FOUND: "error-userNotFound",
+  USER_CANNOT_BE_IGNORED: "error-userCannotBeIgnored",
   USERNAME_ALREADY_SET: "error-usernameAlreadySet",
   USERNAME_CONTAINS_INVALID_CHARACTERS:
     "error-usernameContainsInvalidCharacters",