Remove non-existent feature flags in specs

Remove feature flags from specs that no longer exist as
they are debt

ee/spec/finders/epics_finder_spec.rb

@@ -675,10 +675,6 @@ RSpec.describe EpicsFinder do
     end
 
     context 'when using group cte for search' do
-      before do
-        stub_feature_flags(use_subquery_for_group_issues_search: false)
-      end
-
       it 'returns correct counts when search string is used' do
         results = described_class.new(
           search_user,

ee/spec/models/gitlab_subscription_spec.rb

@@ -5,10 +5,6 @@ require 'spec_helper'
 RSpec.describe GitlabSubscription do
   using RSpec::Parameterized::TableSyntax
 
-  before do
-    stub_feature_flags(elasticsearch_index_only_paid_groups: false)
-  end
-
   %i[free_plan bronze_plan silver_plan gold_plan].each do |plan|
     let_it_be(plan) { create(plan) }
   end

spec/features/merge_request/user_resolves_conflicts_spec.rb

@@ -8,11 +8,6 @@ RSpec.describe 'Merge request > User resolves conflicts', :js do
   let(:project) { create(:project, :repository) }
   let(:user) { project.creator }
 
-  before do
-    # In order to have the diffs collapsed, we need to disable the increase feature
-    stub_feature_flags(gitlab_git_diff_size_limit_increase: false)
-  end
-
   def create_merge_request(source_branch)
     create(:merge_request, source_branch: source_branch, target_branch: 'conflict-start', source_project: project, merge_status: :unchecked) do |mr|
       mr.mark_as_unmergeable

spec/features/merge_request/user_sees_merge_request_pipelines_spec.rb

@@ -27,7 +27,6 @@ RSpec.describe 'Merge request > User sees pipelines triggered by merge request',
 
   before do
     stub_application_setting(auto_devops_enabled: false)
-    stub_feature_flags(ci_merge_request_pipeline: true)
     stub_ci_pipeline_yaml_file(YAML.dump(config))
     project.add_maintainer(user)
     sign_in(user)

spec/features/projects/diffs/diff_show_spec.rb

@@ -155,10 +155,6 @@ RSpec.describe 'Diff file viewer', :js do
 
   context 'binary file that appears to be text in the first 1024 bytes' do
     before do
-      # The file we're visiting is smaller than 10 KB and we want it collapsed
-      # so we need to disable the size increase feature.
-      stub_feature_flags(gitlab_git_diff_size_limit_increase: false)
-
       visit_commit('7b1cf4336b528e0f3d1d140ee50cafdbc703597c')
     end
 

spec/finders/fork_projects_finder_spec.rb

@@ -14,8 +14,6 @@ RSpec.describe ForkProjectsFinder do
   let(:private_fork_member) { create(:user) }
 
   before do
-    stub_feature_flags(object_pools: source_project)
-
     private_fork.update!(visibility_level: Gitlab::VisibilityLevel::PRIVATE)
     private_fork.add_developer(private_fork_member)
 

spec/services/projects/fork_service_spec.rb

@@ -344,10 +344,6 @@ RSpec.describe Projects::ForkService do
     let(:fork_from_project) { create(:project, :public) }
     let(:forker) { create(:user) }
 
-    before do
-      stub_feature_flags(object_pools: true)
-    end
-
     context 'when no pool exists' do
       it 'creates a new object pool' do
         forked_project = fork_project(fork_from_project, forker, using_service: true)