Update edit NOD permissions to just CoB (#16090)

Resolves part of [CASEFLOW-1313](https://vajira.max.gov/browse/CASEFLOW-1313)

### Description
Updates permissions for editing NOD date from attorneys, judges, intake users, and Clerk of the Board to just Clerk of the Board.

### Acceptance Criteria
- [x] Code compiles correctly

### Testing Plan
1. Log in as `COB_USER`
2. Ensure you can edit an AMA appeal (210315-47 for example)
3. Switch to a judge, attorney, and intake user and ensure you can see the change in timeline on the appeal that was edited, but cannot edit NOD date

app/models/user.rb

@@ -98,8 +98,7 @@ def can_view_hearing_schedule?
   end
 
   def can_view_edit_nod_date?
-    (attorney? || judge? || BvaIntake.singleton.users.include?(self) ||
-      ClerkOfTheBoard.singleton.users.include?(self)) && FeatureToggle.enabled?(:edit_nod_date, user: self)
+    ClerkOfTheBoard.singleton.users.include?(self) && FeatureToggle.enabled?(:edit_nod_date, user: self)
   end
 
   def can_vso_hearing_schedule?

spec/feature/queue/case_details_spec.rb

@@ -1369,7 +1369,7 @@
 
           expect(appeal.nod_date).to_not be_nil
           expect(page).to have_content(COPY::CASE_TIMELINE_NOD_RECEIVED)
-          expect(page).to have_content(COPY::CASE_DETAILS_EDIT_NOD_DATE_LINK_COPY)
+          expect(page).to_not have_content(COPY::CASE_DETAILS_EDIT_NOD_DATE_LINK_COPY)
         end
       end
 
@@ -1385,7 +1385,7 @@
 
           expect(appeal.nod_date).to_not be_nil
           expect(page).to have_content(COPY::CASE_TIMELINE_NOD_RECEIVED)
-          expect(page).to have_content(COPY::CASE_DETAILS_EDIT_NOD_DATE_LINK_COPY)
+          expect(page).to_not have_content(COPY::CASE_DETAILS_EDIT_NOD_DATE_LINK_COPY)
         end
       end
 
@@ -1402,15 +1402,16 @@
 
           expect(appeal.nod_date).to_not be_nil
           expect(page).to have_content(COPY::CASE_TIMELINE_NOD_RECEIVED)
-          expect(page).to have_content(COPY::CASE_DETAILS_EDIT_NOD_DATE_LINK_COPY)
+          expect(page).to_not have_content(COPY::CASE_DETAILS_EDIT_NOD_DATE_LINK_COPY)
         end
       end
 
       context "when the user clicks on the edit nod button" do
-        let(:judge_user) { create(:user, css_id: "BVAOSHOWALT", station_id: "101") }
+        let(:cob_user) { create(:user, css_id: "COB_USER", station_id: "101") }
 
         before do
-          User.authenticate!(user: judge_user)
+          ClerkOfTheBoard.singleton.add_user(cob_user)
+          User.authenticate!(user: cob_user)
         end
 
         let(:veteran_full_name) { veteran.first_name + veteran.last_name }
@@ -1546,12 +1547,12 @@
                request_issues: request_issues)
       end
       subject { appeal.validate_all_issues_timely!(receipt_date) }
-      let(:judge_user) { create(:user, css_id: "BVAAABSHIRE", station_id: "101") }
+      let(:cob_user) { create(:user, css_id: "COB_USER", station_id: "101") }
 
       before do
         FeatureToggle.enable!(:edit_nod_date)
-        BvaDispatch.singleton.add_user(judge_user)
-        User.authenticate!(user: judge_user)
+        ClerkOfTheBoard.singleton.add_user(cob_user)
+        User.authenticate!(user: cob_user)
       end
 
       after { FeatureToggle.disable!(:edit_nod_date) }