Delete examples that only pass on retries

These examples were testing the case where a feature flag for the
feature weas disabled, but licensed features aren't dependent on feature
flags so they were always failing on first try.

Interestingly, they passed on retry, which might be a side-effect of
rspec-retry but they should never have passed.

This could be reproduced by

```
bin/rspec './ee/spec/controllers/projects_controller_spec.rb[1:4:6:2:1]'

RETRIES=1 bin/rspec './ee/spec/controllers/projects_controller_spec.rb[1:4:6:2:1]'
```
Signed-off-by: Rémy Coutable <remy@rymai.me>

ee/spec/controllers/projects_controller_spec.rb

@@ -293,18 +293,6 @@ RSpec.describe ProjectsController do
         expect(project.reload.merge_pipelines_enabled).to be_truthy
       end
 
-      context 'when feature flag is disabled' do
-        before do
-          stub_feature_flags(merge_pipelines: false)
-        end
-
-        it 'does not update the attribute' do
-          request
-
-          expect(project.reload.merge_pipelines_enabled).to be_falsy
-        end
-      end
-
       context 'when license is not sufficient' do
         before do
           stub_licensed_features(merge_pipelines: false)
@@ -335,18 +323,6 @@ RSpec.describe ProjectsController do
         expect(project.merge_trains_enabled).to be_truthy
       end
 
-      context 'when feature flag is disabled' do
-        before do
-          stub_feature_flags(merge_trains: false)
-        end
-
-        it 'does not update the attribute' do
-          request
-
-          expect(project.merge_trains_enabled).to be_falsy
-        end
-      end
-
       context 'when license is not sufficient' do
         before do
           stub_licensed_features(merge_trains: false)
@@ -377,18 +353,6 @@ RSpec.describe ProjectsController do
         expect(project.reload.auto_rollback_enabled).to be_truthy
       end
 
-      context 'when feature flag is disabled' do
-        before do
-          stub_feature_flags(auto_rollback: false)
-        end
-
-        it 'does not update the attribute' do
-          request
-
-          expect(project.reload.auto_rollback_enabled).to be_falsy
-        end
-      end
-
       context 'when license is not sufficient' do
         before do
           stub_licensed_features(auto_rollback: false)